WO2012036081A1 - Display device - Google Patents

Display device Download PDF

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Publication number
WO2012036081A1
WO2012036081A1 PCT/JP2011/070580 JP2011070580W WO2012036081A1 WO 2012036081 A1 WO2012036081 A1 WO 2012036081A1 JP 2011070580 W JP2011070580 W JP 2011070580W WO 2012036081 A1 WO2012036081 A1 WO 2012036081A1
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WO
WIPO (PCT)
Prior art keywords
area
display
region
frame
display device
Prior art date
Application number
PCT/JP2011/070580
Other languages
French (fr)
Japanese (ja)
Inventor
寿史 渡辺
謙次 岡元
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to US13/822,728 priority Critical patent/US9111493B2/en
Publication of WO2012036081A1 publication Critical patent/WO2012036081A1/en

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13336—Combining plural substrates to produce large-area displays, e.g. tiled displays
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/02—Arrangements of circuit components or wiring on supporting structure
    • H05K7/026—Multiple connections subassemblies
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/44—Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/02—Composition of display devices
    • G09G2300/026—Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0232—Special driving of display border areas

Definitions

  • the present invention relates to a display device, particularly a direct-view display device.
  • the size of the screen depends on the substrate size.
  • the largest glass substrate (mother substrate) used for manufacturing a liquid crystal display device is the eighth generation (2200 mm ⁇ 2400 mm), and a liquid crystal display device having a diagonal of about 100 inches is manufactured using this substrate. ing.
  • Substrate that can be used for mass production is becoming larger and larger, but its speed is slow, and it is difficult to supply a display device of a larger area required for the current market right now.
  • the liquid crystal display device mainly includes a liquid crystal display panel, a backlight device, a circuit for supplying various electric signals to the liquid crystal display device, a power source, and a housing for housing these.
  • the liquid crystal display panel is mainly composed of a pair of glass substrates and a liquid crystal layer held between them. On one glass substrate, a color filter layer and a counter electrode are formed, and on the other glass substrate, a TFT, a bus line, a drive circuit for supplying signals to these, and the like are formed.
  • the screen size of the direct-view liquid crystal display device is determined by the screen size of the liquid crystal display panel.
  • the liquid crystal display panel has a display area constituted by a plurality of pixels and a frame area around the display area. In the frame region, a pair of substrates are bonded to each other and a seal portion for sealing and holding the liquid crystal layer, a drive circuit mounting portion for driving the pixels, and the like are formed.
  • the present applicant tiles a plurality of 60V type liquid crystal display panels in a matrix, and the width between adjacent display areas (sometimes referred to as “system frame width”) is 6.5 mm (on the right side of the display panel alone and A multi-display system having a lower frame area width of 2.4 mm and a left and upper frame area width of 4.1 mm was announced on June 7, 2010 (http://www.sharp.co. jp / corporate / news / 100607-a.html).
  • the system frame width of this multi-display system is the smallest so far, and the development of a display device in which the seam is difficult to see is desired, although the seam has become inconspicuous.
  • Patent Document 1 discloses a display device that realizes a seamless display by disposing a display panel on the back of two or more display panels.
  • Non-Patent Document 1 describes that the noise can be made inconspicuous by including a noise component in the signal displayed in the display area near the seam.
  • Patent Document 1 requires a display panel disposed on the back surface, and has a problem of high cost. Further, in the technique described in Non-Patent Document 1, since noise appears as a bright spot or a dark spot, it may be recognized as display unevenness.
  • An object of the present invention is to provide a direct-view display device that makes it difficult to see the seam by a method different from the above-described prior art.
  • a display device includes a first display panel having a first display area and a first frame area formed outside the first display area and extending along a first axis, and a second display area.
  • a second display panel having a second frame region formed outside the second display region and extending along the first axis; the first frame region of the first display panel; and the second display panel.
  • a seam region including the first frame region and the second frame region, wherein the first display region intersects the first axis.
  • each of the second frame areas has a plurality of unit areas, and each of the unit areas is an area where the luminance changes and is a minimum area which serves as a reference for comparing the luminance with other areas.
  • the average luminance of the plurality of first peripheral display unit areas included in the first peripheral display area corresponding to the key input video data is the average of the plurality of first central display unit areas included in the first central display area. Higher than brightness.
  • the average luminance of the plurality of first central display unit regions corresponding to input video data of a certain gradation is L Ca
  • the average luminance of the plurality of first peripheral display unit regions is L Pa
  • the relationship d Fa ⁇ d Pa ⁇ 4 d Fa is satisfied.
  • an average luminance of a plurality of second peripheral display unit areas included in the second peripheral display area corresponding to input video data of a certain gradation is a plurality of second luminances included in the second central display area. 2 higher than the average luminance of the central display unit area.
  • the above-described configuration may be obtained for each frame region of the display panels joined to each other.
  • the average luminance of the plurality of second central display unit regions corresponding to input video data of a certain gradation is represented by L Cb
  • the average luminance of the plurality of second peripheral display unit regions is represented by L Pb
  • 2 If the average width of the peripheral display area is d Pb , the average luminance of the plurality of second frame unit areas included in the second frame area is L Fb , and the average width of the second frame area is d Fb , L Fb ⁇ d Fb + L Pb ⁇ d Pb ) / (d Fb + d Pb ) L Cb
  • the relationship d Fb ⁇ d Pb ⁇ 4d Fb is satisfied.
  • the width of the first peripheral display area changes along the first axis.
  • the edge of the first peripheral display region on the first central display region side changes in a wave shape (for example, a sine wave shape) along the first axis.
  • the luminance of the plurality of first peripheral display unit areas corresponding to input video data of a certain gradation has a distribution that is high on the first frame area side and low on the first central display area side. is doing.
  • the first peripheral display area is divided into a plurality of sub-areas arranged along the second axis, and the luminance of the first peripheral display unit area is the same in each sub-area, and the first frame area
  • the brightness of the first peripheral display unit region is higher as the sub-region is closer to, and the brightness of the first peripheral display unit region is lower as the sub-region is closer to the first central display region.
  • the display device further includes a backlight, and the luminance of light emitted from the backlight and incident on the first peripheral display area is emitted from the backlight and is incident on the first central display area. It is higher than the brightness of the incident light.
  • the first frame region and the second frame region are black and are subjected to antireflection treatment.
  • a display device comprising: a first display panel having a first display area and a first frame area formed outside the first display area and extending along a first axis; and a second display area.
  • a second display panel having a second frame region formed outside the second display region and extending along the first axis; the first frame region of the first display panel; and the second display panel.
  • a plurality of first portions arranged in the first frame region, and a joint portion that joins the second frame region to each other, and a joint region including the first frame region and the second frame region.
  • the plurality of first light sources are arranged at a constant pitch along the first axis.
  • each of the first display area, the second display area, the first frame area, and the second frame area has a plurality of unit areas, and the unit areas change in luminance.
  • a plurality of first frame unit areas included in the first frame area which is an area and is a minimum area that serves as a reference for comparing luminance with other areas and corresponds to input video data of a certain gradation Is equal to the average luminance of the plurality of first display unit areas included in the first display area.
  • the display device further includes a plurality of second light sources arranged in the second frame region.
  • the plurality of second light sources are arranged at a constant pitch along the first axis, and the arrangement of the plurality of first light sources and the arrangement of the plurality of second light sources are half of each other.
  • the pitch is off.
  • the plurality of first light sources and the plurality of second light sources are arranged in a matrix.
  • the plurality of first light sources and the plurality of second light sources include a plurality of LEDs, and can perform color display.
  • each of the first display area, the second display area, the first frame area, and the second frame area has a plurality of unit areas, and the unit areas change in luminance.
  • the average luminance of the plurality of first display unit areas included in the first display area is equal to the average luminance of the plurality of second display unit areas included in the second display area.
  • the display device further includes a light guide plate disposed in the first frame region.
  • the first invention and the second invention can also be combined.
  • a light source is arranged in the frame area, and the average luminance of the frame unit area of the frame area in which the light source is arranged is represented by L Fa (L Fa ⁇ d Fa + L Pa
  • the display device further includes a human sensor.
  • a direct-view display device that makes it difficult to see the joint is provided.
  • FIG. 4 is a schematic diagram showing a cross-sectional structure near the joint of the liquid crystal display device 100.
  • FIG. 1 It is a top view which shows the structure of the joint vicinity of the liquid crystal display device 200 of 2nd Embodiment by this invention.
  • (A) is a figure which shows the example of the luminance distribution in the vicinity of the joint area
  • (b) is an image (corresponding to input video data) which should be displayed in the area
  • (A) is a plan view of the liquid crystal display device 200B
  • (b) is a schematic sectional view taken along line 9B-9B 'in (a).
  • (A) is a plan view of the liquid crystal display device 200C
  • (b) is a schematic cross-sectional view taken along the line 10B-10B ′ in (a)
  • (c) is a schematic view of 10C- in (a). It is typical sectional drawing along a 10C 'line.
  • (A) is a figure which shows the example of the luminance distribution in the vicinity of the joint area
  • (b) is an image (corresponding to input video data) which should be displayed in the area
  • a display device according to an embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to the illustrated embodiment.
  • a liquid crystal display device using a liquid crystal display panel is exemplified as the display device, but the display device is not limited to this, and may be a display device using a PDP display panel, an organic EL display panel, an electrophoretic display panel, or the like. .
  • the liquid crystal display device 100 includes liquid crystal display panels 10a to 10d tiled in a matrix.
  • the number of liquid crystal display panels included in the liquid crystal display device according to the embodiment of the present invention is not limited, and the arrangement form is not limited.
  • the liquid crystal display panels 10a to 10d are arranged so that their frame regions are adjacent to each other, and are joined to each other by an adhesive or the like.
  • a portion formed by an adhesive or the like is referred to as a joint portion (joint portion 10ab in FIG. 1B).
  • each liquid crystal display panel is not necessarily the same in the structure of the left and right short sides and the upper and lower long sides, for example, the circuit board is mounted only on the left short side, but the structure described below is easy. Applicable.
  • the liquid crystal display panel 10a has a display area 10aD and a frame area 10aF formed outside the display area 10aD.
  • the liquid crystal display panel 10b is arranged outside the display area 10bD and the display area 10bD. And a formed frame region 10bF.
  • an axis extending in the vertical direction in the display surface is a first axis A1
  • an axis extending in the horizontal direction is a second axis A2.
  • the liquid crystal display panel 10a and the liquid crystal display panel 10b are adjacent to each other along the second axis A2, and are joined to each other via the joint 10ab.
  • first frame region 10aF of the liquid crystal display panel 10a the one extending along the first axis A1 and close to the liquid crystal display panel 10b is referred to as a first frame region 10aF.
  • second frame region 10bF of the liquid crystal display panel 10b that extends along the first axis A1 and is close to the liquid crystal display panel 10a is referred to as a second frame region 10bF.
  • first peripheral display region 10AD P the first peripheral along the second axis A2 a portion adjacent to the display region 10AD P is referred to as a first central display region 10AD C.
  • the second along a second axis A2 a portion adjacent to the peripheral display region 10BD P is referred to as a second central display region 10bD C.
  • the liquid crystal display device 100 makes the joint region 10Jab inconspicuous as follows.
  • the unit area is an area (area) where the luminance changes and is the minimum area (area) that serves as a reference for comparing the luminance with other areas.
  • the minimum region where the luminance changes is a region (pixel region) corresponding to the pixel, and the area of the pixel (opening) does not contribute to display around the pixel (for example, a black matrix (BM))
  • BM black matrix
  • the area shaded by the wiring is an area obtained by adding the amount evenly distributed to each pixel.
  • the pixel is typically arranged in a matrix having rows (X direction) and columns (Y direction), the area of the pixel area, the pixel pitch in the pitch P X and Y direction of the pixel in the X direction P Y It is represented by the product of The luminance of the pixel area is proportional to the luminance of the pixel.
  • the frame region is a light shielding region (for example, a BM is formed), and the luminance of the frame region is the intensity of the reflected ambient light, and the luminance changes in the frame region.
  • the smallest area is each “point” that reflects light and has a smaller area than the pixel area.
  • the minimum region (that is, the unit region of the frame region (frame unit region)) serving as a reference for comparison with the luminance of the pixel region is a region having the same area as the pixel region.
  • a unit area (that is, a display unit area) in the display area is a pixel area.
  • the color of the frame region is preferably black, and the luminance (reflectance) of the frame region is preferably zero.
  • the reflectance of visible light in the frame region is sufficiently low, the color of the frame region does not change due to ambient light, and it is possible to suppress the conspicuous frame.
  • FIG. 1B shows an enlarged view of a region 1B indicated by a broken-line square in FIG.
  • the central display area 10AD C of the liquid crystal display panel 10a has a plurality of central display unit region 10AD C -UA
  • peripheral display region 10AD P multiple peripheral display unit region 10AD P - has a UA
  • the frame region 10 aF has a plurality of frame unit regions 10 aF-UA, corresponding to the input video data of a certain gray level
  • the average luminance of the peripheral display unit region 10AD P -UA is central display unit It is higher than the average luminance of the area 10aD C -UA.
  • the central display unit region 10aD when displaying an image represented by input video data of a certain gradation, all the pixels usually exhibit luminance corresponding to the certain gradation, whereas in the liquid crystal display device 100, the central display unit region 10aD is displayed. It has a peripheral display area 10aD P composed of a peripheral display unit area 10aD P -UA exhibiting a luminance higher than that of C- UA. Adjacent to the frame region 10aF to be darkened observed, since bright peripheral display region 10AD P than the central display area 10AD C is provided, the viewer, both luminance is recognized are averaged. As a result, the frame area 10aF becomes inconspicuous.
  • the liquid crystal display device 100 uses L Ca as the average luminance of the plurality of central display unit areas 10aD C -UA and the average luminance of the plurality of peripheral display unit areas 10aD P -UA corresponding to input video data of a certain gradation.
  • L Pa, width d Pa peripheral display region 10AD P, the average luminance of a plurality of frame unit areas 10aF-UA L Fa, the width of the frame region 10 aF and d Fa, (L Fa ⁇ d Fa + L Pa ⁇ d Pa ) / (the d Fa + d Pa) L Ca is so satisfied, the average of the luminance of the peripheral display region 10AD P of the frame region 10aF is because matches the luminance of the central display area 10AD C, the frame region 10aF is the least noticeable.
  • the frame region 10aF and a peripheral display region 10AD P as another area To do.
  • the width d Pa of peripheral display region 10AD P is preferably less than 4 times Fa (d Pa ⁇ 4d Fa ), more preferably d Pa ⁇ 2d Fa . That is, ⁇ ⁇ 4 is preferable, and ⁇ ⁇ 2 is more preferable.
  • the central display area 10bD C of the liquid crystal display panel 10b has a plurality of central display unit areas 10bD C -UA
  • the peripheral display area 10bD P has a plurality of peripheral display unit areas 10bD P -UA
  • a frame area. 10bF has a plurality of frame unit areas 10bF-UA.
  • the average luminance of the plurality of central display unit areas 10bD C -UA corresponding to a certain gradation of input video data is L Cb
  • the average luminance of the plurality of peripheral display unit areas 10bD P -UA is L Pb
  • the peripheral display area The average width of 10bD P is d Pb
  • the average luminance of the plurality of frame unit regions 10bF-UA is L Fb
  • the average width of the frame region 10aF is d Fb , (L Fb ⁇ d Fb + L Pb ⁇ d Pb ) /
  • (d Fb + d Pb ) L Cb
  • the average of the luminance of the frame region 10bF and the luminance of the peripheral display region 10bD P matches the luminance of the central display region 10bD C , so that the frame region 10bF Most inconspicuous.
  • d Pb > d Fb .
  • the width d Pb near the display area 10BD P is preferably, d Pb ⁇ 2d Fb Is more preferable.
  • the width of the joint region 10Jab is d J with respect to the joint region 10Jab, and d J / 2 ⁇
  • the relations d Pa ⁇ 2d J and d J / 2 ⁇ d Pb ⁇ 2d J may be satisfied.
  • the degree of freedom in design can be increased.
  • FIGS. 2 (a) and 2 (b) The image shown in FIG. 2 is a part of the standard image “N2Nflowers” of the Institute of Image Electronics Engineers (http://wwwsoc.nii.ac.jp/iieej/trans/scid-new.html).
  • liquid crystal display device a multi-display system using a 60V type liquid crystal display panel (hereinafter simply referred to as “liquid crystal display device”) previously announced by the applicant is taken as an example.
  • the width d J (system frame width) of the seam region of this liquid crystal display device is 6.5 mm. Table 1 specifically shows the above conditions for making the joint region difficult to see.
  • the widths of the peripheral display regions 10aD P and 10bD P take an integer multiple of the pixel pitch (P X ) in the row direction
  • a multiple of P X (a positive integer), a length (unit: mm), and ⁇ are shown.
  • the pixel pitch P X in the row direction is 0.97275 mm.
  • ⁇ preferably satisfies 1.00 ⁇ ⁇ 4.00, and more preferably satisfies 1.00 ⁇ ⁇ 2.00.
  • 4P X ⁇ d Pa and d Pb ⁇ 13P X are preferable, and 4P X ⁇ d Pa and d Pb ⁇ 6P X are more preferable.
  • the “pixel” is composed of three “sub-pixels” exhibiting primary colors of red (R), green (G), and blue (B).
  • R red
  • G green
  • B blue
  • the embodiment according to the present invention is not limited to a pixel constituted by three primary colors, and can also be applied to a pixel constituted by four or more primary colors.
  • the central display area the luminance of each pixel included in the six pixels included in the peripheral display region corresponding to a certain input image data 10AD P and 10bD P (6 column of pixels), corresponding to the input image data 10AD C
  • the luminance of each pixel included in 10bD C may be 1.56 times. That is, the standard luminance corresponding to the input video data shown in FIG. 2B (the luminance when the luminance is not adjusted according to the present embodiment) is set to L Ca ′ (the luminance of the pixel in the central display area) and L Pa ′.
  • L Ca ′ the luminance of the pixel in the central display area
  • L Pa ′ the luminance of the pixel in the central display area
  • the luminance of each pixel of the transmissive liquid crystal display device (the luminance of the unit display area is proportional to the luminance of the pixel) is represented by the product of the transmittance of the pixel of the liquid crystal display panel and the luminance of the backlight. Therefore, the maximum luminance is obtained when the luminance of the backlight is maximum and the transmittance of the pixel is maximum.
  • This maximum luminance is set to 400 to 600 cd / m 2 in a general liquid crystal television.
  • the luminance relationship of the above case 1 can be easily realized by adjusting the transmittance of the pixels.
  • the luminance L Ca of the central display area is 1 / 1.56 times the original luminance, so that only this results in a dark display.
  • the luminance of the backlight in the corresponding region can be increased by a known method (for example, increasing the density of prisms and scatterers of the light guide plate).
  • a so-called local dimming method is adopted in which the luminance of the backlight is adjusted in accordance with the image to be displayed in order to increase the contrast ratio of the image.
  • the peripheral display areas 10aD P and 10bD P have constant values with the widths d Pa and d Pb along the first axis A1, but the peripheral display areas 10aD P and 10bD P have a constant value.
  • the shape is not limited to this.
  • the width of the peripheral display region 10AD P and 10BD P may vary along the first axis A1.
  • the central display area 10AD C side end side of the peripheral display region 10AD P, and the central display area 10BD C side end side of the peripheral display region 10BD P is corrugated along a first axis A1 (e.g. sinusoidal) It may change.
  • the boundary between the boundary and the peripheral display region 10BD P and the central display area 10BD C of the peripheral display region 10AD P and the central display area 10AD C becomes inconspicuous.
  • the amplitude may be about 1/5 to 1/2 of the width d Pa and the period may be about twice of d Pa .
  • the luminance distribution may be formed so that the luminance of the peripheral display unit area corresponding to the input video data of a certain gradation is high on the frame area side and low on the central display area side.
  • FIG. 3 (b) it may have an inclination to the luminance distribution in the central display area 10AD C of the peripheral display region 10AD P. That is, the luminance distribution may be formed so that the luminance of the peripheral display unit area corresponding to the input video data of a certain gradation is high on the frame area side and low on the central display area side.
  • the peripheral display area is divided into a plurality of sub-areas 10aD P1 , 10aD P2 , 10aD P3 , 10aD P4 arranged along the second axis A2, and within each sub-area, luminance near the display unit region is the same, as the sub-region near the frame region 10aF high luminance near the display unit region, is set so that the brightness of the peripheral display unit region as sub-regions closer to the central display area 10AD C is low Good (L Pa1 > L Pa2 > L Pa3 > L Pa4 ).
  • the number of sub-regions is not limited to four, and may be set as appropriate. The widths of the sub-regions do not necessarily have to be equal.
  • FIG. 4 schematically shows a cross-sectional structure near the joint of the liquid crystal display device 100.
  • the liquid crystal display panel 10a included in the liquid crystal display device 100 includes, for example, a counter substrate 12a including a color filter, a TFT substrate 14a, and a liquid crystal layer 13a provided between the counter substrate 12a and the TFT substrate 14a. .
  • the counter substrate 12a and the TFT substrate 14a are bonded by a seal portion 15a.
  • a flexible printed circuit board (FPB) 17a for connection to an external circuit is connected to the end of the TFT substrate 14a on the joint side.
  • a housing 16a is arranged to cover the frame area of the liquid crystal display panel 10a.
  • An antireflection film 18a is provided on the surface on the viewer side of the housing 16a.
  • the housing 16a is made of, for example, black plastic (for example, acrylic resin), and the antireflection film 18a is, for example, a photocurable resin film having a moth-eye structure on the surface.
  • the liquid crystal display panel 10b includes, for example, a counter substrate 12b including a color filter, a TFT substrate 14b, and a liquid crystal layer 13b provided between the counter substrate 12b and the TFT substrate 14b. Yes.
  • the counter substrate 12b and the TFT substrate 14b are bonded by a seal portion 15b.
  • a flexible substrate is not provided at the end of the liquid crystal display panel 10b on the joint side. Accordingly, the width of the viewer's face of the casing 16b arranged so as to cover the frame area of the liquid crystal display panel 10b (corresponding to d Fb in FIG. 1B) is the frame area of the liquid crystal display panel 10a.
  • the width (d Fa , d Fb ) of the frame area is generally asymmetric, but as described above, the width (d Pa , d Pb ) of the peripheral display area depends on the frame area.
  • the peripheral display regions having the same width may be arranged symmetrically with respect to the joint region (including the two frame regions and the joint portion).
  • the liquid crystal display device 200 is formed outside the display area 20aD and the display area 20aD, and has a display panel 20a having a frame area 20aF extending along the first axis A1, and outside the display area 20bD and the display area 20bD.
  • the liquid crystal display device 200 further includes a plurality of light sources 42a arranged in the frame region 20aF.
  • the present invention is not limited to this, and a plurality of light sources may be arranged only in the frame area 20bF.
  • the liquid crystal display device 200 adjusts the luminance of the plurality of light sources 42a arranged in the frame region 20aF, thereby bringing the luminance of the joint region 20Jab, which has been conventionally observed in black, close to the luminance of the display region, thereby providing the joint region 20Jab. Make it inconspicuous.
  • the plurality of light sources 42a are arranged at a constant pitch along the first axis A1.
  • the brightness of a certain area (frame unit area) arranged at a certain pitch can be controlled, so that the frame area can be made inconspicuous.
  • the unit area is an area (area) where the luminance changes and is the minimum area (area) that serves as a reference for comparing the luminance with other areas.
  • the unit region in the liquid crystal display device of the first embodiment is a display unit region that is a pixel region and a frame unit region that has the same area as the pixel region.
  • the unit area in the liquid crystal display device according to the second embodiment is an area in which the brightness is adjusted by each of the plurality of light sources 42a arranged in the frame area 20aF (frame unit area) and a frame unit of the display area. It becomes a region (display unit region) having the same area as the region.
  • the frame unit is used. Instead of the region, a joint unit region may be considered.
  • the display unit area can only have an area that is an integral multiple of the pixel area, it may not be possible to define an area that exactly matches the area of the frame unit area (seam unit area), but the frame unit area (seam unit area)
  • the display unit region may be determined so as to be the area closest to the area.
  • FIG. 6A is a diagram illustrating an example of the luminance distribution in the vicinity of the joint region of the liquid crystal display device 200.
  • FIG. Here, for the sake of simplicity, description will be made assuming that the frame region 20aF of the liquid crystal display panel 20a occupies the entire joint region 20Jab.
  • a region corresponding to the light emitting portions of the plurality of light sources 42a arranged in the joint region 20Jab is represented by 20aF E (average luminance: L FEa ), and the region within the joint region 20Jab
  • the area excluding the area corresponding to the light emitting part is represented by 20aF B (average luminance: L FBa ).
  • the width of the joint region 20Jab is d J
  • the light sources 42a are arranged at the pitch p along the first axis A1.
  • a seam unit area (frame unit area) 20aF-UA (average luminance: L Fa ) is an area indicated by a rectangle having a length p and a length d J.
  • L Fa seam unit area (frame unit area) 20af-UA when the area of a region 20af E corresponding to the light emitting portion and S, [(L FEa ⁇ S ) + ⁇ L FBa ⁇ (p ⁇ d J ) ⁇ ] / (P ⁇ d J ).
  • FIG. 6B is a diagram showing an image (standard luminance distribution corresponding to input video data) to be displayed in the area shown in FIG.
  • the average luminance L Da of the display unit area 20aD-UA is equal to the average luminance L ID of the area ID-UA.
  • the display area 20aD includes the average luminance L Fa of the plurality of seam unit areas 20aF-UA included in the seam area (frame area) 20Jab corresponding to the input video data of a certain gradation.
  • a light emitting diode NSSM065 chip size 3.0 mm ⁇ 3.3 mm, light emitting portion 2.6 mm ⁇ ) manufactured by Nichia Corporation can be used.
  • the light-emitting diode NSSM065 is an LED including light-emitting elements of R, G, and B, and the brightness of each of R, G, and B can be adjusted individually, so that an image to be displayed or an image displayed in an adjacent region The light emission luminance and chromaticity can be adjusted accordingly.
  • the seam region 20Jab can be made inconspicuous by arranging the light source and adjusting the luminance so as to satisfy the conditions shown in Table 2.
  • the effect increases by increasing the number of light sources (increasing the arrangement density of the light sources).
  • a light source for example, PICOLED (package size, 1 mm ⁇ 1 mm ⁇ thickness 0.2 mm) manufactured by Rohm can be used.
  • PICOLED package size, 1 mm ⁇ 1 mm ⁇ thickness 0.2 mm
  • the display quality is excellent, but there is a problem that the circuit for driving the LED becomes complicated, or the LED and its mounting cost are high.
  • the arrangement pitch p of the light sources may be set according to the required display quality and / or cost.
  • the preferable pitch p depends on the distance at which the liquid crystal display device is observed, but is generally preferably not less than 1 and not more than 3 times the width d J of the joint region 20Jab.
  • FIG. 7 and 8 schematically show the structure of the liquid crystal display device 200A of the second embodiment.
  • FIG. 7 is a diagram schematically showing a cross-sectional structure near the joint
  • FIG. 8 is a perspective view.
  • the liquid crystal display panels 20a and 20b included in the liquid crystal display device are the same as the liquid crystal display panels 10a and 10b of the liquid crystal display device 100, for example, and the description thereof is omitted here.
  • components that are substantially the same as those of the liquid crystal display device 100 are denoted by common reference numerals, and description thereof may be omitted.
  • the liquid crystal display device 200A has the LED 42a mounted on the mounting substrate 43a on the surface of the housing 16a on the viewer side. The periphery of the LED 42a is protected by a cover member 45a, and an antireflection film 18a is disposed on the LED 42a. Since the liquid crystal display device 200A can operate substantially in the same manner as the liquid crystal display device 200 described above, the joint region can be made inconspicuous.
  • FIG. 9A and 9B schematically show the structure of the liquid crystal display device 200B.
  • FIG. 9A is a plan view of the liquid crystal display device 200B
  • FIG. 9B is a schematic cross-sectional view taken along line 9B-9B 'in FIG. 9A.
  • the liquid crystal display device 200B includes the LED 42a disposed on the surface on the viewer side of the housing 16a, and is further disposed so as to cover the frame region of the liquid crystal display panel 20b.
  • the LED 42b is also disposed on the surface of the housing 16b on the viewer side.
  • the LED 42b is mounted on the mounting board 43b, and the cover member 45b is provided on the mounting board 43b.
  • the LEDs 42b are also arranged at a constant pitch, like the LEDs 42a, but the arrangement of the LEDs 42a and the arrangement of the LEDs 42b are shifted by a half pitch. By adopting such an arrangement, the seam region can be made invisible more efficiently.
  • FIG. 10A to 10C schematically show the structure of the liquid crystal display device 200C.
  • 10A is a plan view of the liquid crystal display device 200C
  • FIG. 10B is a schematic cross-sectional view taken along the line 10B-10B ′ in FIG. 10A.
  • FIG. 10 is a schematic cross-sectional view taken along line 10C-10C ′ in FIG.
  • the liquid crystal display device 200C has a set of an LED 42a and a light guide plate 44a instead of the LED 42a in the liquid crystal display device 200A. Therefore, the number of LEDs 42a included in the liquid crystal display device 200C is smaller than the number of LEDs 42a included in the liquid crystal display device 200A.
  • the light guide plate 44a is a light guide plate for edge light, and has a convex portion 44ad for diffusing light on the back surface of the light guide plate 44a (the surface on the viewer side of the housing 16a). As is well known, the intensity distribution of light emitted from the light guide plate 44a can be adjusted by the size and density of the convex portions 44ad.
  • the light guide plate 44a is not limited to this, and various known light guide plates can be used.
  • the first embodiment and the second embodiment can be appropriately combined (third embodiment).
  • the liquid crystal display device 300 shown in FIG. 11 includes liquid crystal display panels 30a and 30b, and has a peripheral display region as in the liquid crystal display device 100 of the first embodiment, and the liquid crystal display device 300 of the second embodiment.
  • the joint region has a plurality of light sources.
  • the average luminance of the frame unit area 30aF-UA of the frame area in which the light source is arranged is L Fa
  • (L Fa ⁇ d Fa + L Pa ⁇ d Pa ) / (d Fa + d Pa ) L Ca
  • L Ca It is preferable to adjust the luminance of each region so that is established.
  • the average luminance of the frame unit area 30aF-UA of the frame area where the light source is arranged and the average luminance L Pa of the peripheral display unit area are adjusted to be equal to the average luminance L Ca of the central display unit area.
  • the average luminance L Fa of the frame unit area 30aF-UA includes the area 30aF E (average luminance: L FEa ) corresponding to the light emitting unit, and the other frame area 30aF B (average luminance: L FBa ). It is calculated as an area weighted average.
  • a rectangular area having a length of p and width d x composed of a seam unit area and two peripheral display unit areas arranged on both sides thereof is considered as one unit area.
  • the average luminance of the unit area is shown in FIG. 11B.
  • the average luminance (ID-UA in FIG. 11B) of the image (standard luminance distribution corresponding to the input video data) to be displayed in the unit area is shown.
  • (Average luminance: L ID ) which is realized by, for example, increasing the luminance of the backlight that irradiates the peripheral display area, as described for the liquid crystal display device 100 of the first embodiment. it can.
  • the configuration in which either the average brightness of the peripheral display unit area is increased according to the first embodiment or the average brightness of the frame unit area is increased according to the second embodiment is adopted.
  • the peripheral display Areas and seam areas may be noticeable.
  • a human sensor for example, an infrared sensor
  • the human sensor determines that the person has approached the liquid crystal display device more than a predetermined distance, a normal display operation is performed. It may be configured to do. That is, the display operation of increasing the brightness of the peripheral display area and / or the brightness of the joint area may not be performed.
  • the present invention can be widely applied to display devices, particularly direct-view display devices.

Abstract

A direct-view display device (100) comprises: first and second display panels (10a, 20a); and a joint region (10Jab) which includes first and second frame regions (10aF, 10bF) and a joining section (10ab) where the first frame region (10aF) and the second frame region (10bF) are joined together. A first display region (10aD) of the first display panel (10a) comprises: a first peripheral display region (10aDPa) adjacent to the first frame region (10aF); and a first central display region (10aDC) adjacent to the first peripheral display region (10aDPa). Each region comprises a plurality of unit regions, and the average luminance (LPa) of a plurality of first peripheral display unit regions (10aDPa-UA) included in the first peripheral display region (10aDPa) is higher than the average luminance (LCa) of a plurality of first central display unit regions (10aDC-UA) included in the first central display region (10aDC).

Description

表示装置Display device
　本発明は、表示装置、特に直視型の表示装置に関する。 The present invention relates to a display device, particularly a direct-view display device.
　近年、テレビや情報表示用の表示装置において、大型化への強い要望がある。大型の表示装置の代表として、発光ダイオード（ＬＥＤ）などの自発光素子をマトリクス状に配列した表示装置や投射プロジェクション表示装置があるが、これらは画質の点で不利であり、高画質の表示が可能な直視型の液晶表示装置（ＬＣＤ）やプラズマ表示装置（ＰＤＰ）のさらなる大型化が望まれている。 In recent years, there is a strong demand for enlargement of display devices for televisions and information displays. As representatives of large display devices, there are display devices and projection projection display devices in which self-luminous elements such as light emitting diodes (LEDs) are arranged in a matrix, but these are disadvantageous in terms of image quality, and display of high image quality is possible. Further enlargement of possible direct-view type liquid crystal display devices (LCD) and plasma display devices (PDP) is desired.
　直視型の液晶表示装置やプラズマ表示装置は、基本的にガラス基板上に形成されるため、その画面の大きさは基板サイズに依存する。現在、液晶表示装置の製造に用いられているガラス基板（マザー基板）は、第８世代（２２００ｍｍ×２４００ｍｍ）が最大であり、この基板を用いて対角約１００インチの液晶表示装置が製造されている。量産に使用できる基板はますます大型化していくものの、その速度は緩やかであり、現在の市場に要求されているさらに大面積の表示装置を今すぐ供給することは難しい。 Since direct-view type liquid crystal display devices and plasma display devices are basically formed on a glass substrate, the size of the screen depends on the substrate size. Currently, the largest glass substrate (mother substrate) used for manufacturing a liquid crystal display device is the eighth generation (2200 mm × 2400 mm), and a liquid crystal display device having a diagonal of about 100 inches is manufactured using this substrate. ing. Substrate that can be used for mass production is becoming larger and larger, but its speed is slow, and it is difficult to supply a display device of a larger area required for the current market right now.
　そこで、従来から表示装置の大画面化を実現する方法として、複数の表示装置を配列し（タイリングということがある）、大画面の表示装置を擬似的に実現する試みがなされている。しかしながら、タイリング技術を用いると、複数の表示装置の継ぎ目が見えるという問題がある。液晶表示装置を例にこの問題を説明する。 Therefore, as a method for realizing a large screen of a display device, an attempt has been made to realize a large screen display device by arranging a plurality of display devices (sometimes referred to as tiling). However, when the tiling technique is used, there is a problem that seams of a plurality of display devices can be seen. This problem will be described using a liquid crystal display device as an example.
　なお、液晶表示装置は、主に、液晶表示パネル、バックライト装置、液晶表示装置に各種の電気信号を供給する回路や電源およびこれらを収容する筐体を備えている。液晶表示パネルは、主に一対のガラス基板と、これらの間に保持された液晶層とから構成されている。一方のガラス基板には、カラーフィルタ層や対向電極が形成されており、他方のガラス基板には、ＴＦＴやバスラインおよびこれらに信号を供給するための駆動回路などが形成されている。直視型の液晶表示装置の画面サイズは、液晶表示パネルの画面サイズで決まる。また、液晶表示パネルは、複数の画素によって構成される表示領域と、その周辺の額縁領域とを有している。額縁領域には、一対の基板を互いに貼り合わせるとともに液晶層を密閉・保持するためのシール部や、画素を駆動するための駆動回路実装部等が形成されている。 The liquid crystal display device mainly includes a liquid crystal display panel, a backlight device, a circuit for supplying various electric signals to the liquid crystal display device, a power source, and a housing for housing these. The liquid crystal display panel is mainly composed of a pair of glass substrates and a liquid crystal layer held between them. On one glass substrate, a color filter layer and a counter electrode are formed, and on the other glass substrate, a TFT, a bus line, a drive circuit for supplying signals to these, and the like are formed. The screen size of the direct-view liquid crystal display device is determined by the screen size of the liquid crystal display panel. Further, the liquid crystal display panel has a display area constituted by a plurality of pixels and a frame area around the display area. In the frame region, a pair of substrates are bonded to each other and a seal portion for sealing and holding the liquid crystal layer, a drive circuit mounting portion for driving the pixels, and the like are formed.
　このように、液晶表示パネルには表示に寄与しない額縁領域が存在するので、複数の液晶表示パネルを配列することによって大画面を構成すると、画像に継ぎ目が生じてしまう。この問題は液晶表示装置に限らず、ＰＤＰ、有機ＥＬ表示装置、電気泳動表示装置等、直視型の表示装置に共通の問題である。 As described above, since there is a frame area that does not contribute to display in the liquid crystal display panel, when a large screen is formed by arranging a plurality of liquid crystal display panels, a seam is generated in the image. This problem is not limited to liquid crystal display devices, but is common to direct-view display devices such as PDPs, organic EL display devices, and electrophoretic display devices.
　本出願人は、複数の６０Ｖ型液晶表示パネルをマトリクス状にタイリングし、隣接する表示領域間の幅（「システムフレーム幅」ということがある。）が６．５ｍｍ（表示パネル単体の右側および下側の額縁領域の幅は２．４ｍｍ、左側および上側の額縁領域の幅は４．１ｍｍ）のマルチディスプレイシステムを２０１０年６月７日に発表した（http://www.sharp.co.jp/corporate/news/100607-a.html）。このマルチディスプレイシステムのシステムフレーム幅はこれまでで最小であり、継ぎ目は目立ち難くなったものの、さらに継ぎ目が見え難い表示装置の開発が望まれている。 The present applicant tiles a plurality of 60V type liquid crystal display panels in a matrix, and the width between adjacent display areas (sometimes referred to as “system frame width”) is 6.5 mm (on the right side of the display panel alone and A multi-display system having a lower frame area width of 2.4 mm and a left and upper frame area width of 4.1 mm was announced on June 7, 2010 (http://www.sharp.co. jp / corporate / news / 100607-a.html). The system frame width of this multi-display system is the smallest so far, and the development of a display device in which the seam is difficult to see is desired, although the seam has become inconspicuous.
　特許文献１には、２つ以上の表示パネルの背面にさらに表示パネルを配置することによって、継ぎ目のない表示を実現する表示装置が開示されている。 Patent Document 1 discloses a display device that realizes a seamless display by disposing a display panel on the back of two or more display panels.
　非特許文献１には、継ぎ目付近の表示領域で表示する信号にノイズ成分を含ませることによって、継ぎ目を目立たなくできると記載されている。 Non-Patent Document 1 describes that the noise can be made inconspicuous by including a noise component in the signal displayed in the display area near the seam.
特開２００２－３０４１３５号公報JP 2002-304135 A
　しかしながら、特許文献１に記載の表示装置は、背面に配置する表示パネルが必要であり、コストが高いという問題がある。また、非特許文献１に記載の技術では、ノイズが輝点または暗点として見えるので、表示のむらとして認識されるおそれがある。 However, the display device described in Patent Document 1 requires a display panel disposed on the back surface, and has a problem of high cost. Further, in the technique described in Non-Patent Document 1, since noise appears as a bright spot or a dark spot, it may be recognized as display unevenness.
　本発明は、上記の従来技術とは異なる方法で継ぎ目を見え難くした直視型の表示装置を提供することを目的とする。 An object of the present invention is to provide a direct-view display device that makes it difficult to see the seam by a method different from the above-described prior art.
　第１の発明による表示装置は、第１表示領域と前記第１表示領域の外側に形成され、第１軸に沿って延びる第１額縁領域とを有する第１表示パネルと、第２表示領域と前記第２表示領域の外側に形成され、前記第１軸に沿って延びる第２額縁領域とを有する第２表示パネルと、前記第１表示パネルの前記第１額縁領域と、前記第２表示パネルの前記第２額縁領域とを互いに接合する接合部と、前記第１額縁領域および第２額縁領域とを含む継ぎ目領域とを有し、前記第１表示領域は、前記第１軸と交差する第２軸に沿って前記第１額縁領域に隣接する第１周辺表示領域と、前記第２軸に沿って前記第１周辺表示領域に隣接する第１中央表示領域とを有し、前記第２表示領域は、前記第２軸に沿って前記第２額縁領域に隣接する第２周辺表示領域と、前記第２軸に沿って前記第２周辺表示領域に隣接する第２中央表示領域とを有し、前記第１表示領域、前記第２表示領域、前記第１額縁領域、および、前記第２額縁領域のそれぞれは複数の単位領域を有し、前記単位領域は、輝度が変化する領域であって、かつ、他の領域と輝度を比較する基準となる最小の領域であり、ある階調の入力映像データに対応する、前記第１周辺表示領域に含まれる複数の第１周辺表示単位領域の平均輝度は、前記第１中央表示領域に含まれる複数の第１中央表示単位領域の平均輝度よりも高い。 A display device according to a first invention includes a first display panel having a first display area and a first frame area formed outside the first display area and extending along a first axis, and a second display area. A second display panel having a second frame region formed outside the second display region and extending along the first axis; the first frame region of the first display panel; and the second display panel. And a seam region including the first frame region and the second frame region, wherein the first display region intersects the first axis. A first peripheral display area adjacent to the first frame area along two axes and a first central display area adjacent to the first peripheral display area along the second axis; The area is a second peripheral display adjacent to the second frame area along the second axis. And a second central display area adjacent to the second peripheral display area along the second axis, the first display area, the second display area, the first frame area, and the Each of the second frame areas has a plurality of unit areas, and each of the unit areas is an area where the luminance changes and is a minimum area which serves as a reference for comparing the luminance with other areas. The average luminance of the plurality of first peripheral display unit areas included in the first peripheral display area corresponding to the key input video data is the average of the plurality of first central display unit areas included in the first central display area. Higher than brightness.
　ある実施形態において、ある階調の入力映像データに対応する、前記複数の第１中央表示単位領域の平均輝度をＬCa、前記複数の第１周辺表示単位領域の平均輝度をＬPa、前記第１周辺表示領域の平均の幅をｄPa、前記第１額縁領域に含まれる複数の第１額縁単位領域の平均輝度をＬFa、前記第１額縁領域の平均の幅をｄFaとすると、（ＬFa・ｄFa＋ＬPa・ｄPa）／（ｄFa＋ｄPa）＝ＬCaが成立する。「・」は乗算を意味する。 In one embodiment, the average luminance of the plurality of first central display unit regions corresponding to input video data of a certain gradation is L Ca , the average luminance of the plurality of first peripheral display unit regions is L Pa , and the first When the average width of one peripheral display area is d Pa , the average brightness of a plurality of first frame unit areas included in the first frame area is L Fa , and the average width of the first frame area is d Fa , L Fa · d Fa + L Pa · d Pa ) / (d Fa + d Pa ) = LCa is established. “·” Means multiplication.
　ある実施形態において、ｄFa＜ｄPa＜４ｄFaの関係を満足する。 In one embodiment, the relationship d Fa <d Pa <4 d Fa is satisfied.
　ある実施形態において、ある階調の入力映像データに対応する、前記第２周辺表示領域に含まれる複数の第２周辺表示単位領域の平均輝度は、前記第２中央表示領域に含まれる複数の第２中央表示単位領域の平均輝度よりも高い。３以上の表示パネルを有する場合は、互いに接合される表示パネルの各額縁領域について、上記の構成が得られるようにすればよい。 In one embodiment, an average luminance of a plurality of second peripheral display unit areas included in the second peripheral display area corresponding to input video data of a certain gradation is a plurality of second luminances included in the second central display area. 2 higher than the average luminance of the central display unit area. In the case of having three or more display panels, the above-described configuration may be obtained for each frame region of the display panels joined to each other.
　ある実施形態において、ある階調の入力映像データに対応する、前記複数の第２中央表示単位領域の平均輝度をＬCb、前記複数の第２周辺表示単位領域の平均輝度をＬPb、前記第２周辺表示領域の平均の幅をｄPb、前記第２額縁領域に含まれる複数の第２額縁単位領域の平均輝度をＬFb、前記第２額縁領域の平均の幅をｄFbとすると、（ＬFb・ｄFb＋ＬPb・ｄPb）／（ｄFb＋ｄPb）＝ＬCbが成立する。 In one embodiment, the average luminance of the plurality of second central display unit regions corresponding to input video data of a certain gradation is represented by L Cb , the average luminance of the plurality of second peripheral display unit regions is represented by L Pb , 2 If the average width of the peripheral display area is d Pb , the average luminance of the plurality of second frame unit areas included in the second frame area is L Fb , and the average width of the second frame area is d Fb , L Fb · d Fb + L Pb · d Pb ) / (d Fb + d Pb ) = L Cb
　ある実施形態において、ｄFb＜ｄPb＜４ｄFbの関係を満足する。 In some embodiments, the relationship d Fb <d Pb <4d Fb is satisfied.
　ある実施形態において、前記継ぎ目領域の平均の幅をｄJとすると、ｄJ／２＜ｄPa＜２ｄJおよびｄJ／２＜ｄPb＜２ｄJの関係を満足する。 In one embodiment, assuming that the average width of the joint region is d J , the relationship of d J / 2 <d Pa <2d J and d J / 2 <d Pb <2d J is satisfied.
　ある実施形態において、前記第１周辺表示領域の幅は前記第１軸に沿って変化している。例えば、前記第１周辺表示領域の前記第１中央表示領域側の端辺は、前記第１軸に沿って波状（例えば正弦波状）に変化する。 In one embodiment, the width of the first peripheral display area changes along the first axis. For example, the edge of the first peripheral display region on the first central display region side changes in a wave shape (for example, a sine wave shape) along the first axis.
　ある実施形態において、ある階調の入力映像データに対応する、前記複数の第１周辺表示単位領域の輝度は、前記第１額縁領域側で高く、前記第１中央表示領域側で低い分布を有している。例えば、前記第１周辺表示領域を前記第２軸に沿って配列された複数のサブ領域に分割し、各サブ領域内では前記第１周辺表示単位領域の輝度は同じで、前記第１額縁領域に近いサブ領域ほど前記第１周辺表示単位領域の輝度が高く、前記第１中央表示領域に近いサブ領域ほど前記第１周辺表示単位領域の輝度が低い。 In one embodiment, the luminance of the plurality of first peripheral display unit areas corresponding to input video data of a certain gradation has a distribution that is high on the first frame area side and low on the first central display area side. is doing. For example, the first peripheral display area is divided into a plurality of sub-areas arranged along the second axis, and the luminance of the first peripheral display unit area is the same in each sub-area, and the first frame area The brightness of the first peripheral display unit region is higher as the sub-region is closer to, and the brightness of the first peripheral display unit region is lower as the sub-region is closer to the first central display region.
　ある実施形態において、前記表示装置は、バックライトをさらに有し、前記バックライトから出射され前記第１周辺表示領域に入射する光の輝度は、前記バックライトから出射され前記第１中央表示領域に入射する光の輝度よりも高い。 In one embodiment, the display device further includes a backlight, and the luminance of light emitted from the backlight and incident on the first peripheral display area is emitted from the backlight and is incident on the first central display area. It is higher than the brightness of the incident light.
　ある実施形態において、前記第１額縁領域および前記第２額縁領域は黒色であって、反射防止処理が施されている。 In one embodiment, the first frame region and the second frame region are black and are subjected to antireflection treatment.
　第２の発明の表示装置は、第１表示領域と前記第１表示領域の外側に形成され、第１軸に沿って延びる第１額縁領域とを有する第１表示パネルと、第２表示領域と前記第２表示領域の外側に形成され、前記第１軸に沿って延びる第２額縁領域とを有する第２表示パネルと、前記第１表示パネルの前記第１額縁領域と、前記第２表示パネルの前記第２額縁領域とを互いに接合する接合部と、前記第１額縁領域および第２額縁領域とを含む継ぎ目領域とを有し、さらに、前記第１額縁領域に配置された複数の第１光源を有する。 According to a second aspect of the present invention, there is provided a display device comprising: a first display panel having a first display area and a first frame area formed outside the first display area and extending along a first axis; and a second display area. A second display panel having a second frame region formed outside the second display region and extending along the first axis; the first frame region of the first display panel; and the second display panel. A plurality of first portions arranged in the first frame region, and a joint portion that joins the second frame region to each other, and a joint region including the first frame region and the second frame region. Has a light source.
　ある実施形態において、前記複数の第１光源は前記第１軸に沿って一定のピッチで配列されている。 In one embodiment, the plurality of first light sources are arranged at a constant pitch along the first axis.
　ある実施形態において、前記第１表示領域、前記第２表示領域、前記第１額縁領域、および、前記第２額縁領域のそれぞれは複数の単位領域を有し、前記単位領域は、輝度が変化する領域であって、かつ、他の領域と輝度を比較する基準となる最小の領域であり、ある階調の入力映像データに対応する、前記第１額縁領域に含まれる複数の第１額縁単位領域の平均輝度は、前記第１表示領域に含まれる複数の第１表示単位領域の平均輝度と等しい。 In one embodiment, each of the first display area, the second display area, the first frame area, and the second frame area has a plurality of unit areas, and the unit areas change in luminance. A plurality of first frame unit areas included in the first frame area, which is an area and is a minimum area that serves as a reference for comparing luminance with other areas and corresponds to input video data of a certain gradation Is equal to the average luminance of the plurality of first display unit areas included in the first display area.
　ある実施形態において、前記表示装置は、さらに、前記第２額縁領域に配置された複数の第２光源を有する。 In one embodiment, the display device further includes a plurality of second light sources arranged in the second frame region.
　ある実施形態において、前記複数の第２光源は前記第１軸に沿って一定のピッチで配列されており、且つ、前記複数の第１光源の配列と前記複数の第２光源の配列とが半ピッチずれている。 In one embodiment, the plurality of second light sources are arranged at a constant pitch along the first axis, and the arrangement of the plurality of first light sources and the arrangement of the plurality of second light sources are half of each other. The pitch is off.
　ある実施形態において、前記複数の第１光源および前記複数の第２光源はマトリクス状に配列されている。ここで、前記複数の第１光源および前記複数の第２光源は複数のＬＥＤを含み、カラー表示を行うことができる。 In one embodiment, the plurality of first light sources and the plurality of second light sources are arranged in a matrix. Here, the plurality of first light sources and the plurality of second light sources include a plurality of LEDs, and can perform color display.
　ある実施形態において、前記第１表示領域、前記第２表示領域、前記第１額縁領域、および、前記第２額縁領域のそれぞれは複数の単位領域を有し、前記単位領域は、輝度が変化する領域であって、かつ、他の領域と輝度を比較する基準となる最小の領域であり、ある階調の入力映像データに対応する、前記継ぎ目領域に含まれる複数の継ぎ目単位領域の平均輝度は、前記第１表示領域に含まれる複数の第１表示単位領域の平均輝度および前記第２表示領域に含まれる複数の第２表示単位領域の平均輝度と等しい。 In one embodiment, each of the first display area, the second display area, the first frame area, and the second frame area has a plurality of unit areas, and the unit areas change in luminance. An average luminance of a plurality of seam unit areas included in the seam area corresponding to input video data of a certain gradation, which is an area and a minimum area serving as a reference for comparing brightness with other areas. The average luminance of the plurality of first display unit areas included in the first display area is equal to the average luminance of the plurality of second display unit areas included in the second display area.
　ある実施形態において、前記表示装置は、さらに、前記第１額縁領域に配置された導光板を有する。 In one embodiment, the display device further includes a light guide plate disposed in the first frame region.
　第１の発明と第２の発明とを組み合わせることもできる。例えば、第１の発明によるある実施形態の表示装置において、額縁領域に光源を配置し、光源が配置された額縁領域の額縁単位領域の平均輝度をＬFaとして、（ＬFa・ｄFa＋ＬPa・ｄPa）／（ｄFa＋ｄPa）＝ＬCaという関係式を成立するようにしてもよい。 The first invention and the second invention can also be combined. For example, in the display device according to an embodiment of the first invention, a light source is arranged in the frame area, and the average luminance of the frame unit area of the frame area in which the light source is arranged is represented by L Fa (L Fa · d Fa + L Pa The relational expression d Pa ) / (d Fa + d Pa ) = LCa may be established.
　ある実施形態において、前記表示装置は、人感センサをさらに備える。 In one embodiment, the display device further includes a human sensor.
　本発明によると、継ぎ目を見え難くした直視型の表示装置が提供される。 According to the present invention, a direct-view display device that makes it difficult to see the joint is provided.
（ａ）および（ｂ）は、本発明による第１の実施形態の液晶表示装置１００の構造を説明するための図であり、（ａ）は斜視図であり、（ｂ）は（ａ）中に破線の四角で示した領域１Ｂの拡大図である。(A) And (b) is a figure for demonstrating the structure of the liquid crystal display device 100 of 1st Embodiment by this invention, (a) is a perspective view, (b) is in (a). It is an enlarged view of the area | region 1B shown by the broken-line square. （ａ）は、液晶表示装置１００の継ぎ目付近に表示される画像（輝度分布）を示す図であり、（ｂ）は、入力映像データに対応する標準の輝度の分布を示す図である。(A) is a figure which shows the image (luminance distribution) displayed near the joint of the liquid crystal display device 100, (b) is a figure which shows distribution of the standard luminance corresponding to input video data. （ａ）および（ｂ）は、液晶表示装置１００に適用され得る他の周辺表示領域の構成を説明するための模式図である。(A) And (b) is a schematic diagram for demonstrating the structure of the other periphery display area | region which can be applied to the liquid crystal display device 100. FIG. 液晶表示装置１００の継ぎ目付近の断面構造を示す模式図である。4 is a schematic diagram showing a cross-sectional structure near the joint of the liquid crystal display device 100. FIG. 本発明による第２の実施形態の液晶表示装置２００の継ぎ目付近の構造を示す平面図である。It is a top view which shows the structure of the joint vicinity of the liquid crystal display device 200 of 2nd Embodiment by this invention. （ａ）は、液晶表示装置２００の継ぎ目領域の近傍における輝度分布の例を示す図であり、（ｂ）は（ａ）に示された領域に表示されるべき画像（入力映像データに対応する標準の輝度分布）を示す図である。(A) is a figure which shows the example of the luminance distribution in the vicinity of the joint area | region of the liquid crystal display device 200, (b) is an image (corresponding to input video data) which should be displayed in the area | region shown to (a). It is a figure which shows (standard luminance distribution). 液晶表示装置２００Ａの継ぎ目付近の断面構造を示す模式図である。It is a schematic diagram which shows the cross-sectional structure of the seam vicinity of liquid crystal display device 200A. 液晶表示装置２００Ａの継ぎ目付近の斜視図である。It is a perspective view near the joint of liquid crystal display device 200A. （ａ）は液晶表示装置２００Ｂの平面図であり、（ｂ）は（ａ）中の９Ｂ－９Ｂ’線に沿った模式的な断面図である。(A) is a plan view of the liquid crystal display device 200B, and (b) is a schematic sectional view taken along line 9B-9B 'in (a). （ａ）は液晶表示装置２００Ｃの平面図であり、（ｂ）は（ａ）中の１０Ｂ－１０Ｂ’線に沿った模式的な断面図であり、（ｃ）は（ａ）中の１０Ｃ－１０Ｃ’線に沿った模式的な断面図である。(A) is a plan view of the liquid crystal display device 200C, (b) is a schematic cross-sectional view taken along the line 10B-10B ′ in (a), and (c) is a schematic view of 10C- in (a). It is typical sectional drawing along a 10C 'line. （ａ）は、液晶表示装置３００の継ぎ目領域の近傍における輝度分布の例を示す図であり、（ｂ）は（ａ）に示された領域に表示されるべき画像（入力映像データに対応する標準の輝度分布）を示す図である。(A) is a figure which shows the example of the luminance distribution in the vicinity of the joint area | region of the liquid crystal display device 300, (b) is an image (corresponding to input video data) which should be displayed in the area | region shown to (a). It is a figure which shows (standard luminance distribution).
　以下、図面を参照して本発明による実施形態の表示装置を説明するが、本発明は例示する実施形態に限定されない。ここでは、表示装置として、液晶表示パネルを用いた液晶表示装置を例示するが、これに限られずＰＤＰ用表示パネル、有機ＥＬ表示パネル、電気泳動表示パネル等を用いた表示装置であってもよい。 Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to the illustrated embodiment. Here, a liquid crystal display device using a liquid crystal display panel is exemplified as the display device, but the display device is not limited to this, and may be a display device using a PDP display panel, an organic EL display panel, an electrophoretic display panel, or the like. .
　まず、図１～図４を参照して、本発明による第１の実施形態の液晶表示装置１００の構造とその動作を説明する。 First, the structure and operation of the liquid crystal display device 100 according to the first embodiment of the present invention will be described with reference to FIGS.
　図１（ａ）に示すように、液晶表示装置１００は、マトリクス状にタイリングされた液晶表示パネル１０ａ～１０ｄを有している。もちろん、本発明による実施形態の液晶表示装置が有する液晶表示パネルの数に制限はなく、また、配列形態にも制限はない。液晶表示パネル１０ａ～１０ｄはそれぞれの額縁領域が互いに隣接するように配置され、接着剤などによって互いに接合されている。ここでは、接着剤などによって形成されている部分を接合部ということにする（図１（ｂ）中の接合部１０ａｂ）。 As shown in FIG. 1A, the liquid crystal display device 100 includes liquid crystal display panels 10a to 10d tiled in a matrix. Of course, the number of liquid crystal display panels included in the liquid crystal display device according to the embodiment of the present invention is not limited, and the arrangement form is not limited. The liquid crystal display panels 10a to 10d are arranged so that their frame regions are adjacent to each other, and are joined to each other by an adhesive or the like. Here, a portion formed by an adhesive or the like is referred to as a joint portion (joint portion 10ab in FIG. 1B).
　以下では、液晶表示パネル１０ａおよび１０ｂとその継ぎ目の構造について説明する。他の液晶表示パネルおよび他の継ぎ目の構造は、基本的に同じであるので、説明を省略する。もちろん、各液晶表示パネルは、例えば、左側の短辺にのみ回路基板が実装されるなど、左右の短辺や上下の長辺の構造は必ずしも同じではないが、下記で説明する構造を容易に適用できる。 Hereinafter, the structure of the liquid crystal display panels 10a and 10b and their joints will be described. Since the other liquid crystal display panels and the other joints are basically the same in structure, description thereof is omitted. Of course, each liquid crystal display panel is not necessarily the same in the structure of the left and right short sides and the upper and lower long sides, for example, the circuit board is mounted only on the left short side, but the structure described below is easy. Applicable.
　液晶表示パネル１０ａは、表示領域１０ａＤと、表示領域１０ａＤの外側に形成された額縁領域１０ａＦとを有しており、液晶表示パネル１０ｂは、同様に、表示領域１０ｂＤと、表示領域１０ｂＤの外側に形成された額縁領域１０ｂＦとを有している。ここで、図１（ｂ）に示すように、表示面内の垂直方向に延びる軸を第１軸Ａ１、水平方向に延びる軸を第２軸Ａ２とする。液晶表示パネル１０ａと液晶表示パネル１０ｂとは、第２軸Ａ２に沿って隣接し、接合部１０ａｂを介して互いに接合されている。液晶表示パネル１０ａの額縁領域１０ａＦの内で、第１軸Ａ１に沿って延び、且つ、液晶表示パネル１０ｂに近接するものを第１額縁領域１０ａＦということにする。同様に、液晶表示パネル１０ｂの額縁領域１０ｂＦの内で、第１軸Ａ１に沿って延び、且つ、液晶表示パネル１０ａに近接するものを第２額縁領域１０ｂＦという。また、液晶表示パネル１０ａの表示領域１０ａＤの内で第２軸Ａ２に沿って第１額縁領域１０ａＦに隣接する部分を第１周辺表示領域１０ａＤPと呼び、第２軸Ａ２に沿って第１周辺表示領域１０ａＤＰに隣接する部分を第１中央表示領域１０ａＤＣと呼ぶ。同様に、液晶表示パネル１０ｂの表示領域１０ｂＤの内で第２軸Ａ２に沿って第２額縁領域１０ｂＦに隣接する部分を第２周辺表示領域１０ｂＤＰと呼び、第２軸Ａ２に沿って第２周辺表示領域１０ｂＤＰに隣接する部分を第２中央表示領域１０ｂＤＣと呼ぶ。 The liquid crystal display panel 10a has a display area 10aD and a frame area 10aF formed outside the display area 10aD. Similarly, the liquid crystal display panel 10b is arranged outside the display area 10bD and the display area 10bD. And a formed frame region 10bF. Here, as shown in FIG. 1B, an axis extending in the vertical direction in the display surface is a first axis A1, and an axis extending in the horizontal direction is a second axis A2. The liquid crystal display panel 10a and the liquid crystal display panel 10b are adjacent to each other along the second axis A2, and are joined to each other via the joint 10ab. Of the frame region 10aF of the liquid crystal display panel 10a, the one extending along the first axis A1 and close to the liquid crystal display panel 10b is referred to as a first frame region 10aF. Similarly, the frame region 10bF of the liquid crystal display panel 10b that extends along the first axis A1 and is close to the liquid crystal display panel 10a is referred to as a second frame region 10bF. Further, the along the second axis A2 portion adjacent to the first frame region 10aF within the display area 10AD of the liquid crystal display panel 10a is referred to as a first peripheral display region 10AD P, the first peripheral along the second axis A2 a portion adjacent to the display region 10AD P is referred to as a first central display region 10AD C. Similarly, along the second axis A2 portion adjacent to the second frame region 10bF within the display area 10BD of the liquid crystal display panel 10b is referred to as a second peripheral display region 10BD P, the second along a second axis A2 a portion adjacent to the peripheral display region 10BD P is referred to as a second central display region 10bD C.
　液晶表示パネル１０ａの第１額縁領域１０ａＦと、液晶表示パネル１０ｂの第２額縁領域１０ｂＦとを互いに接合する接合部１０ａｂと、第１額縁領域１０ａＦおよび第２額縁領域１０ｂＦとを含む領域を継ぎ目領域１０Ｊａｂと呼ぶ。液晶表示装置１００は、以下のようにして、継ぎ目領域１０Ｊａｂを目立たなくしている。 A region including a joint portion 10ab for joining the first frame region 10aF of the liquid crystal display panel 10a and the second frame region 10bF of the liquid crystal display panel 10b to each other, and a region including the first frame region 10aF and the second frame region 10bF. Call 10 Jab. The liquid crystal display device 100 makes the joint region 10Jab inconspicuous as follows.
　ここで、各領域の輝度の分布を表すため、および、領域間の輝度を比較するために、「単位領域」という概念を導入する。単位領域は、輝度が変化する領域（エリア）であって、かつ、他の領域と輝度を比較する基準となる最小の領域（エリア）をいう。表示領域において、輝度が変化する最小の領域は、画素に対応する領域（画素領域）であり、画素（開口部）の面積に、画素の周辺の表示に寄与しない部分（例えばブラックマトリクス（ＢＭ）や配線によって遮光される部分）の面積を各画素に均等に分配した分を足した面積を有する。画素が行（Ｘ方向）および列（Ｙ方向）を有するマトリクス状に配列されている典型的な場合、画素領域の面積は、Ｘ方向における画素のピッチＰXとＹ方向における画素のピッチＰYとの積で表される。画素領域の輝度は画素の輝度に比例する。第１の実施形態において、額縁領域は遮光領域（例えばＢＭが形成されている）であり、額縁領域の輝度は、反射された周囲光の強度ということになり、額縁領域において、輝度が変化する最小の領域は光を反射する各「点」であり、画素領域よりも面積が小さい。従って、額縁領域において、画素領域の輝度と比較する基準となる最小の領域（すなわち額縁領域の単位領域（額縁単位領域））は、画素領域と同じ面積を持つ領域ということになる。表示領域における単位領域（すなわち表示単位領域）は、画素領域である。 Here, the concept of “unit region” is introduced in order to represent the luminance distribution of each region and to compare the luminance between the regions. The unit area is an area (area) where the luminance changes and is the minimum area (area) that serves as a reference for comparing the luminance with other areas. In the display region, the minimum region where the luminance changes is a region (pixel region) corresponding to the pixel, and the area of the pixel (opening) does not contribute to display around the pixel (for example, a black matrix (BM)) And the area shaded by the wiring) is an area obtained by adding the amount evenly distributed to each pixel. If the pixel is typically arranged in a matrix having rows (X direction) and columns (Y direction), the area of the pixel area, the pixel pitch in the pitch P X and Y direction of the pixel in the X direction P Y It is represented by the product of The luminance of the pixel area is proportional to the luminance of the pixel. In the first embodiment, the frame region is a light shielding region (for example, a BM is formed), and the luminance of the frame region is the intensity of the reflected ambient light, and the luminance changes in the frame region. The smallest area is each “point” that reflects light and has a smaller area than the pixel area. Therefore, in the frame region, the minimum region (that is, the unit region of the frame region (frame unit region)) serving as a reference for comparison with the luminance of the pixel region is a region having the same area as the pixel region. A unit area (that is, a display unit area) in the display area is a pixel area.
　なお、額縁領域の色は黒が好ましく、額縁領域の輝度（反射率）は零であることが好ましい。額縁領域における可視光の反射率が十分に低いと、周囲光によって額縁領域の色が変化することがなく、額縁を目立つことを抑制できる。また、額縁領域の観察者側表面に、反射防止処理および／またはアンチグレア処理を施すことが好ましい。これらは公知の方法で行うことができる。 Note that the color of the frame region is preferably black, and the luminance (reflectance) of the frame region is preferably zero. When the reflectance of visible light in the frame region is sufficiently low, the color of the frame region does not change due to ambient light, and it is possible to suppress the conspicuous frame. Moreover, it is preferable to perform an antireflection treatment and / or an antiglare treatment on the observer side surface of the frame region. These can be performed by a known method.
　図１（ｂ）に、図１（ａ）中に破線の四角で示した領域１Ｂの拡大図を示す。図１（ｂ）に示すように、液晶表示パネル１０ａの中央表示領域１０ａＤCは複数の中央表示単位領域１０ａＤC－ＵＡを有し、周辺表示領域１０ａＤPは複数の周辺表示単位領域１０ａＤP－ＵＡを有し、額縁領域１０ａＦは複数の額縁単位領域１０ａＦ－ＵＡを有しており、ある階調の入力映像データに対応する、周辺表示単位領域１０ａＤP－ＵＡの平均輝度は、中央表示単位領域１０ａＤC－ＵＡの平均輝度よりも高い。すなわち、ある階調の入力映像データで表される画像を表示する場合、通常、全ての画素が当該ある階調に対応する輝度を呈するのに対し、液晶表示装置１００では、中央表示単位領域１０ａＤC－ＵＡの輝度よりも高い輝度を呈する周辺表示単位領域１０ａＤP－ＵＡで構成される周辺表示領域１０ａＤPを有している。暗く観察される額縁領域１０ａＦに隣接して、中央表示領域１０ａＤCよりも明るい周辺表示領域１０ａＤPが設けられているので、観察者には、両者の輝度が平均されて認識される。その結果、額縁領域１０ａＦが目立たなくなる。 FIG. 1B shows an enlarged view of a region 1B indicated by a broken-line square in FIG. As shown in FIG. 1 (b), the central display area 10AD C of the liquid crystal display panel 10a has a plurality of central display unit region 10AD C -UA, peripheral display region 10AD P multiple peripheral display unit region 10AD P - has a UA, the frame region 10 aF has a plurality of frame unit regions 10 aF-UA, corresponding to the input video data of a certain gray level, the average luminance of the peripheral display unit region 10AD P -UA is central display unit It is higher than the average luminance of the area 10aD C -UA. That is, when displaying an image represented by input video data of a certain gradation, all the pixels usually exhibit luminance corresponding to the certain gradation, whereas in the liquid crystal display device 100, the central display unit region 10aD is displayed. It has a peripheral display area 10aD P composed of a peripheral display unit area 10aD P -UA exhibiting a luminance higher than that of C- UA. Adjacent to the frame region 10aF to be darkened observed, since bright peripheral display region 10AD P than the central display area 10AD C is provided, the viewer, both luminance is recognized are averaged. As a result, the frame area 10aF becomes inconspicuous.
　例えば、液晶表示装置１００は、ある階調の入力映像データに対応する、複数の中央表示単位領域１０ａＤC－ＵＡの平均輝度をＬCa、複数の周辺表示単位領域１０ａＤP－ＵＡの平均輝度をＬPa、周辺表示領域１０ａＤPの幅をｄPa、複数の額縁単位領域１０ａＦ－ＵＡの平均輝度をＬFa、額縁領域１０ａＦの幅をｄFaとし、（ＬFa・ｄFa＋ＬPa・ｄPa）／（ｄFa＋ｄPa）＝ＬCaが成立するようにすると、額縁領域１０ａＦの輝度と周辺表示領域１０ａＤPの輝度との平均が、中央表示領域１０ａＤCの輝度と一致するので、額縁領域１０ａＦが最も目立たない。 For example, the liquid crystal display device 100 uses L Ca as the average luminance of the plurality of central display unit areas 10aD C -UA and the average luminance of the plurality of peripheral display unit areas 10aD P -UA corresponding to input video data of a certain gradation. L Pa, width d Pa peripheral display region 10AD P, the average luminance of a plurality of frame unit areas 10aF-UA L Fa, the width of the frame region 10 aF and d Fa, (L Fa · d Fa + L Pa · d Pa ) / (the d Fa + d Pa) = L Ca is so satisfied, the average of the luminance of the peripheral display region 10AD P of the frame region 10aF is because matches the luminance of the central display area 10AD C, the frame region 10aF is the least noticeable.
　ここで、額縁領域１０ａＦからの反射がない場合には、ＬFa＝０であり、上記の式は（ＬPa・ｄPa）／（ｄFa＋ｄPa）＝ＬCaとなる。ここで、ｄPa＝α・ｄFaとすると、ＬPa＝（１＋１／α）ＬCaが得られる。すなわち、例えばα＝１（ｄPa＝ｄFa）のとき、ＬPa＝２ＬCaとなる。しかしながら、隣接する領域との輝度差が大きくなると別の領域として視認されやすいので、ＬCa＜ＬPa＜２ＬCaとなるように、α＞１（ｄPa＞ｄFa）であることが好ましい。 Here, when there is no reflection from the frame region 10aF, L Fa = 0, and the above formula becomes (L Pa · d Pa ) / (d Fa + d Pa ) = L Ca. Here, if d Pa = α · d Fa , L Pa = (1 + 1 / α) LCa is obtained. That is, for example, when α = 1 (d Pa = d Fa ), L Pa = 2L Ca. However, it is preferable that α> 1 (d Pa > d Fa ) so that L Ca <L Pa <2L Ca because the luminance difference between the adjacent regions is easily recognized as another region.
　なお、観察者が、液晶表示装置１００に近づき過ぎると、額縁領域１０ａＦの輝度と周辺表示領域１０ａＤPの輝度とが平均されず、額縁領域１０ａＦと周辺表示領域１０ａＤPとを別の領域として視認する。観察者が額縁領域１０ａＦと周辺表示領域１０ａＤPとを別の領域として認識する距離を小さくするためには、周辺表示領域１０ａＤPの幅ｄPaはできるだけ小さいことが好ましく、額縁領域１０ａＦの幅ｄFaの４倍未満であること（ｄPa＜４ｄFa）が好ましく、ｄPa＜２ｄFaであることがさらに好ましい。すなわち、α＜４が好ましく、α＜２がさらに好ましい。 Incidentally, viewing the observer is too close to the liquid crystal display device 100, not the brightness of the brightness and the peripheral display region 10AD P of the frame region 10aF are averaged, the frame region 10aF and a peripheral display region 10AD P as another area To do. To an observer to reduce recognize distance a frame region 10aF and a peripheral display region 10AD P as another area, it is preferably the width d Pa of peripheral display region 10AD P as small as possible, the width d of the frame region 10aF It is preferably less than 4 times Fa (d Pa <4d Fa ), more preferably d Pa <2d Fa . That is, α <4 is preferable, and α <2 is more preferable.
　同様に、液晶表示パネル１０ｂの中央表示領域１０ｂＤCは複数の中央表示単位領域１０ｂＤC－ＵＡを有し、周辺表示領域１０ｂＤPは複数の周辺表示単位領域１０ｂＤP－ＵＡを有し、額縁領域１０ｂＦは複数の額縁単位領域１０ｂＦ－ＵＡを有している。液晶表示パネル１０ｂについても、ある階調の入力映像データに対応する、周辺表示単位領域１０ｂＤP－ＵＡの平均輝度を、中央表示単位領域１０ｂＤC－ＵＡの平均輝度よりも高く設定することによって、同様の効果を得ることができる。また、ある階調の入力映像データに対応する、複数の中央表示単位領域１０ｂＤC－ＵＡの平均輝度をＬCb、複数の周辺表示単位領域１０ｂＤP－ＵＡの平均輝度をＬPb、周辺表示領域１０ｂＤPの平均の幅をｄPb、複数の額縁単位領域１０ｂＦ－ＵＡの平均輝度をＬFb、額縁領域１０ａＦの平均の幅をｄFbとし、（ＬFb・ｄFb＋ＬPb・ｄPb）／（ｄFb＋ｄPb）＝ＬCbが成立するようにすると、額縁領域１０ｂＦの輝度と周辺表示領域１０ｂＤPの輝度との平均が、中央表示領域１０ｂＤCの輝度と一致するので、額縁領域１０ｂＦが最も目立たない。このとき、ｄPb＞ｄFbであることが好ましい。また、周辺表示領域１０ｂＤPの幅ｄPbはできるだけ小さいことが好ましく、額縁領域１０ｂＦの幅ｄFbの４倍未満であること（ｄPb＜４ｄFb）が好ましく、ｄPb＜２ｄFbであることがさらに好ましい。 Similarly, the central display area 10bD C of the liquid crystal display panel 10b has a plurality of central display unit areas 10bD C -UA, the peripheral display area 10bD P has a plurality of peripheral display unit areas 10bD P -UA, and a frame area. 10bF has a plurality of frame unit areas 10bF-UA. Also for the liquid crystal display panel 10b, by setting the average luminance of the peripheral display unit region 10bD P -UA corresponding to the input video data of a certain gradation to be higher than the average luminance of the central display unit region 10bD C -UA, Similar effects can be obtained. Also, the average luminance of the plurality of central display unit areas 10bD C -UA corresponding to a certain gradation of input video data is L Cb , the average luminance of the plurality of peripheral display unit areas 10bD P -UA is L Pb , and the peripheral display area The average width of 10bD P is d Pb , the average luminance of the plurality of frame unit regions 10bF-UA is L Fb , and the average width of the frame region 10aF is d Fb , (L Fb · d Fb + L Pb · d Pb ) / When (d Fb + d Pb ) = L Cb is established, the average of the luminance of the frame region 10bF and the luminance of the peripheral display region 10bD P matches the luminance of the central display region 10bD C , so that the frame region 10bF Most inconspicuous. At this time, it is preferable that d Pb > d Fb . Further, it is preferable the width d Pb near the display area 10BD P as small as possible, less than 4 times the width d Fb of the frame region 10bF (d Pb <4d Fb) is preferably, d Pb <2d Fb Is more preferable.
　ここでは、液晶表示パネル１０ａおよび１０ｂについてそれぞれ独立にその額縁領域を目立たなくするための条件を説明したが、継ぎ目領域１０Ｊａｂに対して、継ぎ目領域１０Ｊａｂの幅をｄJとし、ｄJ／２＜ｄPa＜２ｄJおよびｄJ／２＜ｄPb＜２ｄJの関係を満足するようにしてもよい。図１（ｂ）に例示したように、ｄFa＝ｄFbかつｄJ＝ｄFa+ｄFbのときは、上述したように、液晶表示パネル１０ａおよび１０ｂについてそれぞれ独立にその額縁領域を目立たなくする条件と同じであるが、液晶表示パネルの構造が非対称な場合には、設計の自由度を増すことができる。例えば、ｄFa>ｄFbの場合に、ｄPa＜２ｄJ、ｄPb＜２ｄJかつ、ｄPa＝ｄPbとすることができる。継ぎ目領域１０Ｊａｂは一体として暗く観察されるのに対して、周辺表示領域１０ａＤPと周辺表示領域１０ｂＤPとは互いに離れているので、別の領域として視認されやすい。周辺表示領域１０ａＤPおよび周辺表示領域１０ｂＤPの幅を互いに等しくし（ｄPa＝ｄPb）、継ぎ目領域１０Ｊａｂに関して対称な構造とすることによって、違和感を低減させることができる。このとき、α＝（ｄPa＋ｄPb）／ｄJで表され、１＜α＜４を満足する。 Here, the conditions for making the frame region inconspicuous independently for the liquid crystal display panels 10a and 10b have been described. However, the width of the joint region 10Jab is d J with respect to the joint region 10Jab, and d J / 2 < The relations d Pa <2d J and d J / 2 <d Pb <2d J may be satisfied. As illustrated in FIG. 1B, when d Fa = d Fb and d J = d Fa + d Fb , as described above, the frame regions of the liquid crystal display panels 10a and 10b are not conspicuous independently. However, if the structure of the liquid crystal display panel is asymmetric, the degree of freedom in design can be increased. For example, when d Fa> d Fb , d Pa <2d J , d Pb <2d J and d Pa = d Pb can be satisfied. The seam area 10Jab relative to that observed dark integrally, since apart from each other and the peripheral display region 10AD P and the peripheral display region 10BD P, is recognized as another area easily. The width of the peripheral display region 10AD P and the peripheral display region 10BD P equal (d Pa = d Pb), by a symmetrical structure with respect to the seam area 10Jab, it is possible to reduce the discomfort. At this time, α = (d Pa + d Pb ) / d J and 1 <α <4 is satisfied.
　次に、図２（ａ）および（ｂ）を参照して、具体的例を示す。なお、図２に示す画像は、画像電子学会の標準画像「N2 flowers」の一部である（http://wwwsoc.nii.ac.jp/iieej/trans/scid-new.html）。 Next, a specific example will be shown with reference to FIGS. 2 (a) and 2 (b). The image shown in FIG. 2 is a part of the standard image “N2Nflowers” of the Institute of Image Electronics Engineers (http://wwwsoc.nii.ac.jp/iieej/trans/scid-new.html).
　ここでは、先に出願人が発表した、６０Ｖ型液晶表示パネルを用いたマルチディスプレイシステム（以下、単に「液晶表示装置」という。）を例にとる。この液晶表示装置の継ぎ目領域の幅ｄJ（システムフレーム幅）は６．５ｍｍである。この継ぎ目領域を見え難くするための上記の条件を具体的に表１に示す。ここでは、ｄPa＝ｄPbで、α＝（ｄPa＋ｄPb）／ｄJの場合を示す。また、周辺表示領域１０ａＤP、１０ｂＤPの幅は、行方向における画素ピッチ（ＰX）の整数倍の値を取るので、表１には、ｄPa＝ｄPbの幅を行方向における画素ピッチＰXの倍数（正の整数）、長さ（単位ｍｍ）および、αで表したものを示している。行方向における画素ピッチＰXは０．９７２７５ｍｍである。上述したように、αは、１．００＜α＜４．００を満足することが好ましく、１．００＜α＜２．００を満足することがさらに好ましい。これを行方向における画素ピッチＰXの倍数で表すと、４ＰX≦ｄPa、ｄPb≦１３ＰXが好ましく、４ＰX≦ｄPa、ｄPb≦６ＰXがさらに好ましい。このとき、輝度比ＬPa／ＬCa（＝ＬPb／ＬCb）は２．００未満であり、周辺表示領域が目立つのを抑制することができる。なお、ここでは、「画素」は、赤（Ｒ）・緑（Ｇ）・青（Ｂ）の各原色を呈する３つの「サブ画素」で構成されている。もちろん、本発明による実施形態は、３原色で構成される画素に限られず、４原色以上の多原色で構成される画素にも適用できる。 Here, a multi-display system using a 60V type liquid crystal display panel (hereinafter simply referred to as “liquid crystal display device”) previously announced by the applicant is taken as an example. The width d J (system frame width) of the seam region of this liquid crystal display device is 6.5 mm. Table 1 specifically shows the above conditions for making the joint region difficult to see. Here, a case where d Pa = d Pb and α = (d Pa + d Pb ) / d J is shown. Further, since the widths of the peripheral display regions 10aD P and 10bD P take an integer multiple of the pixel pitch (P X ) in the row direction, Table 1 shows the width of d Pa = d Pb as the pixel pitch in the row direction. A multiple of P X (a positive integer), a length (unit: mm), and α are shown. The pixel pitch P X in the row direction is 0.97275 mm. As described above, α preferably satisfies 1.00 <α <4.00, and more preferably satisfies 1.00 <α <2.00. When this is expressed as a multiple of the pixel pitch P X in the row direction, 4P X ≦ d Pa and d Pb ≦ 13P X are preferable, and 4P X ≦ d Pa and d Pb ≦ 6P X are more preferable. At this time, the luminance ratio L Pa / L Ca (= L Pb / L Cb ) is less than 2.00, and the peripheral display area can be suppressed from being noticeable. Here, the “pixel” is composed of three “sub-pixels” exhibiting primary colors of red (R), green (G), and blue (B). Of course, the embodiment according to the present invention is not limited to a pixel constituted by three primary colors, and can also be applied to a pixel constituted by four or more primary colors.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　例えば、周辺表示領域１０ａＤPおよび１０ｂＤPの幅を６ＰXとする場合、ｄPaおよびｄPbはそれぞれ５．８３６５ｍｍとなる。このとき、ある入力映像データに対応する周辺表示領域１０ａＤPおよび１０ｂＤPに含まれる６画素（６つの画素列）に含まれる各画素の輝度を、当該入力映像データに対応する中央表示領域１０ａＤCおよび１０ｂＤCに含まれる各画素の輝度の１．５６倍とすればよい。すなわち、図２（ｂ）に示す入力映像データに対応する標準の輝度（本実施形態による輝度の調整を行わない場合の輝度）をＬCa’（中央表示領域の画素の輝度）およびＬPa’（周辺表示領域の画素の輝度）とすると、例えば、図２（ａ）に示すように、（ケース１）ＬPa＝ＬPa’として、ＬCa＝ＬCa’／１．５６としてもよいし、あるいは逆に、（ケース２）ＬPa＝１．５６・ＬPa’として、ＬCa＝ＬCa’としてもよい。消費電力の観点からは、ケース２が好ましい。この理由を以下に説明する。 For example, when the width of the peripheral display region 10AD P and 10BD P and 6P X, d Pa and d Pb becomes 5.8365mm respectively. At this time, the central display area the luminance of each pixel included in the six pixels included in the peripheral display region corresponding to a certain input image data 10AD P and 10bD P (6 column of pixels), corresponding to the input image data 10AD C And the luminance of each pixel included in 10bD C may be 1.56 times. That is, the standard luminance corresponding to the input video data shown in FIG. 2B (the luminance when the luminance is not adjusted according to the present embodiment) is set to L Ca ′ (the luminance of the pixel in the central display area) and L Pa ′. For example, as shown in FIG. 2A, (Case 1) L Pa = L Pa ′ and L Ca = L Ca ′ /1.56 may be used. Or, conversely, (Case 2) L Pa = 1.56 · L Pa ′, and L Ca = L Ca ′. Case 2 is preferable from the viewpoint of power consumption. The reason for this will be described below.
　透過型液晶表示装置の各画素の輝度（単位表示領域の輝度は画素の輝度に比例する）は、液晶表示パネルの画素の透過率とバックライトの輝度との積で表される。従って、バックライトの輝度が最大で、画素の透過率が最大のときに、最高輝度になる。この最高輝度は、一般の液晶テレビでは４００～６００ｃｄ／ｍ2に設定されている。ここで、上記のケース１の輝度の関係は、画素の透過率を調整することによって容易に実現することができる。但し、このとき、中央表示領域の輝度ＬCaは本来の輝度の１／１．５６倍になるので、これだけでは、暗い表示になる。 The luminance of each pixel of the transmissive liquid crystal display device (the luminance of the unit display area is proportional to the luminance of the pixel) is represented by the product of the transmittance of the pixel of the liquid crystal display panel and the luminance of the backlight. Therefore, the maximum luminance is obtained when the luminance of the backlight is maximum and the transmittance of the pixel is maximum. This maximum luminance is set to 400 to 600 cd / m 2 in a general liquid crystal television. Here, the luminance relationship of the above case 1 can be easily realized by adjusting the transmittance of the pixels. However, at this time, the luminance L Ca of the central display area is 1 / 1.56 times the original luminance, so that only this results in a dark display.
　そこで、バックライトの輝度（全体）を１．５６倍にすれば、表示領域の大部分を占める中央表示領域の輝度を本来の輝度にすることができる。すなわち、ケース２を実現できる。但し、この方法では、消費電力の増大を招く。そこで、バックライトから出射され周辺表示領域１０ａＤPおよび１０ｂＤPに入射する光の輝度が、バックライトから出射され中央表示領域１０ａＤCおよび１０ｂＤCに入射する光の輝度よりも高いバックライトを準備する。このようにすると、消費電力の増大は、周辺表示領域１０ａＤPおよび１０ｂＤPに向けて光を出射するバックライトの輝度を上昇させる分だけなので、上記の方法に比べて小さい。具体的には、直下型のバックライトの場合は、周辺表示領域１０ａＤPおよび１０ｂＤPに対応する光源（ＬＥＤやＣＣＦＬ）に印加する電圧を増大させる、あるいは、配置する光源の密度を上げることによって実現できる。導光板を用いるエッジライト型の場合には、公知の方法（例えば、導光板のプリズムや散乱体の密度を上げる）によって、対応する領域のバックライトの輝度を増大させることができる。また、最近の液晶テレビでは、画像のコントラスト比を高めるために、表示する画像に応じて、バックライトの輝度を調整する、いわゆるローカルディミング法が採用されている。このように、バックライトの輝度分布を調整する機能を有している液晶表示装置においては、ソフトウェアを変更するだけで、ケース２を容易に実現できる。 Therefore, if the luminance (overall) of the backlight is increased 1.56 times, the luminance of the central display area that occupies most of the display area can be made the original luminance. That is, Case 2 can be realized. However, this method causes an increase in power consumption. Therefore, a backlight is prepared in which the luminance of light emitted from the backlight and incident on the peripheral display regions 10aD P and 10bD P is higher than the luminance of light emitted from the backlight and incident on the central display regions 10aD C and 10bD C. . In this way, the increase in power consumption, since an amount corresponding to toward the peripheral display region 10AD P and 10BD P raises the luminance of the backlight for emitting light smaller than the above-mentioned method. Specifically, in the case of direct backlight, to increase the voltage applied to the light source (LED or CCFL) corresponding to the peripheral display region 10AD P and 10BD P, or by increasing the density of light sources arranged realizable. In the case of an edge light type using a light guide plate, the luminance of the backlight in the corresponding region can be increased by a known method (for example, increasing the density of prisms and scatterers of the light guide plate). In recent liquid crystal televisions, a so-called local dimming method is adopted in which the luminance of the backlight is adjusted in accordance with the image to be displayed in order to increase the contrast ratio of the image. Thus, in the liquid crystal display device having a function of adjusting the luminance distribution of the backlight, the case 2 can be easily realized only by changing the software.
　上記の説明では、周辺表示領域１０ａＤPおよび１０ｂＤPは、それぞれの幅ｄPaおよびｄPbが第１軸Ａ１に沿っていて一定の値を有しているが、周辺表示領域１０ａＤPおよび１０ｂＤPの形状はこれに限られない。例えば、図３（ａ）に示すように、周辺表示領域１０ａＤPおよび１０ｂＤPの幅は、第１軸Ａ１に沿って変化してもよい。例えば、周辺表示領域１０ａＤPの中央表示領域１０ａＤC側の端辺、および周辺表示領域１０ｂＤPの中央表示領域１０ｂＤC側の端辺は、第１軸Ａ１に沿って波状（例えば正弦波状）に変化してもよい。このようにすると、周辺表示領域１０ａＤPと中央表示領域１０ａＤCとの境界および周辺表示領域１０ｂＤPと中央表示領域１０ｂＤCとの境界が目立たなくなる。例えば、振幅は幅ｄPaの１／５～１／２程度、周期はｄPaの２倍程度とすればよい。 In the above description, the peripheral display areas 10aD P and 10bD P have constant values with the widths d Pa and d Pb along the first axis A1, but the peripheral display areas 10aD P and 10bD P have a constant value. The shape is not limited to this. For example, as shown in FIG. 3 (a), the width of the peripheral display region 10AD P and 10BD P may vary along the first axis A1. For example, the central display area 10AD C side end side of the peripheral display region 10AD P, and the central display area 10BD C side end side of the peripheral display region 10BD P is corrugated along a first axis A1 (e.g. sinusoidal) It may change. In this way, the boundary between the boundary and the peripheral display region 10BD P and the central display area 10BD C of the peripheral display region 10AD P and the central display area 10AD C becomes inconspicuous. For example, the amplitude may be about 1/5 to 1/2 of the width d Pa and the period may be about twice of d Pa .
　また、図３（ｂ）に示すように、周辺表示領域１０ａＤPの中央表示領域１０ａＤCの輝度分布に傾斜を持たせてもよい。すなわち、ある階調の入力映像データに対応する、周辺表示単位領域の輝度が、額縁領域側で高く、中央表示領域側で低いように、輝度分布を形成してもよい。例えば、図３（ｂ）に示すように、周辺表示領域を第２軸Ａ２に沿って配列された複数のサブ領域１０ａＤP1、１０ａＤP2、１０ａＤP3、１０ａＤP4に分割し、各サブ領域内では周辺表示単位領域の輝度は同じで、額縁領域１０ａＦに近いサブ領域ほど周辺表示単位領域の輝度が高く、中央表示領域１０ａＤCに近いサブ領域ほど周辺表示単位領域の輝度が低いように設定すればよい（ＬPa1＞ＬPa2＞ＬPa3＞ＬPa4）。また、サブ領域の数は、４に限られず、適宜設定すればよく、各サブ領域の幅は必ずしも等しくなくてもよい。 Further, as shown in FIG. 3 (b), it may have an inclination to the luminance distribution in the central display area 10AD C of the peripheral display region 10AD P. That is, the luminance distribution may be formed so that the luminance of the peripheral display unit area corresponding to the input video data of a certain gradation is high on the frame area side and low on the central display area side. For example, as shown in FIG. 3B, the peripheral display area is divided into a plurality of sub-areas 10aD P1 , 10aD P2 , 10aD P3 , 10aD P4 arranged along the second axis A2, and within each sub-area, luminance near the display unit region is the same, as the sub-region near the frame region 10aF high luminance near the display unit region, is set so that the brightness of the peripheral display unit region as sub-regions closer to the central display area 10AD C is low Good (L Pa1 > L Pa2 > L Pa3 > L Pa4 ). Further, the number of sub-regions is not limited to four, and may be set as appropriate. The widths of the sub-regions do not necessarily have to be equal.
　図４に、液晶表示装置１００の継ぎ目付近の断面構造を模式的に示す。 FIG. 4 schematically shows a cross-sectional structure near the joint of the liquid crystal display device 100.
　液晶表示装置１００が有する液晶表示パネル１０ａは、例えばカラーフィルタを備える対向基板１２ａと、ＴＦＴ基板１４ａと、対向基板１２ａとＴＦＴ基板１４ａとの間に設けられた液晶層１３ａとを有している。対向基板１２ａとＴＦＴ基板１４ａとはシール部１５ａによって接着されている。ＴＦＴ基板１４ａの継ぎ目側の端部には、外部回路に接続するためのフレキシブルプリント基板（ＦＰＢ）１７ａが接続されている。液晶表示パネル１０ａの額縁領域を覆うように筐体１６ａが配置されている。筐体１６ａの観察者側の面には反射防止膜１８ａが設けられている。筐体１６ａは例えば黒色のプラスチック（例えばアクリル樹脂）で形成されており、反射防止膜１８ａは例えば表面にモスアイ構造を有する光硬化性樹脂膜である。 The liquid crystal display panel 10a included in the liquid crystal display device 100 includes, for example, a counter substrate 12a including a color filter, a TFT substrate 14a, and a liquid crystal layer 13a provided between the counter substrate 12a and the TFT substrate 14a. . The counter substrate 12a and the TFT substrate 14a are bonded by a seal portion 15a. A flexible printed circuit board (FPB) 17a for connection to an external circuit is connected to the end of the TFT substrate 14a on the joint side. A housing 16a is arranged to cover the frame area of the liquid crystal display panel 10a. An antireflection film 18a is provided on the surface on the viewer side of the housing 16a. The housing 16a is made of, for example, black plastic (for example, acrylic resin), and the antireflection film 18a is, for example, a photocurable resin film having a moth-eye structure on the surface.
　液晶表示パネル１０ｂも液晶表示パネル１０ａと同様に、例えばカラーフィルタを備える対向基板１２ｂと、ＴＦＴ基板１４ｂと、対向基板１２ｂとＴＦＴ基板１４ｂとの間に設けられた液晶層１３ｂとを有している。対向基板１２ｂとＴＦＴ基板１４ｂとはシール部１５ｂによって接着されている。液晶表示パネル１０ｂの継ぎ目側の端部にはフレキシブル基板は設けられていない。従って、液晶表示パネル１０ｂの額縁領域を覆うように配置されている筐体１６ｂの観察者の面の幅（図１（ｂ）中のｄFbに相当）は、液晶表示パネル１０ａの額縁領域を覆うように配置されている筐体１６ａの観察者の面の幅（図１（ｂ）中のｄFaに相当）よりも狭い。液晶表示パネルの端子部（液晶表示パネル１０ａの、ＦＰＢ１７ａと接続される部分）は、液晶表示パネルの水平方向の一方にだけ設けられることが多い。従って、ここで例示したように、額縁領域の幅（ｄFa、ｄFb）は一般に非対称になるが、上述したように、周辺表示領域の幅（ｄPa、ｄPb）は、額縁領域に応じて異ならせてもよいし、継ぎ目領域（２つの額縁領域と接合部とを含む）に対して対称に、同じ幅の周辺表示領域を配置してもよい。 Similarly to the liquid crystal display panel 10a, the liquid crystal display panel 10b includes, for example, a counter substrate 12b including a color filter, a TFT substrate 14b, and a liquid crystal layer 13b provided between the counter substrate 12b and the TFT substrate 14b. Yes. The counter substrate 12b and the TFT substrate 14b are bonded by a seal portion 15b. A flexible substrate is not provided at the end of the liquid crystal display panel 10b on the joint side. Accordingly, the width of the viewer's face of the casing 16b arranged so as to cover the frame area of the liquid crystal display panel 10b (corresponding to d Fb in FIG. 1B) is the frame area of the liquid crystal display panel 10a. It is narrower than the width of the surface of the observer of the casing 16a arranged to cover (corresponding to d Fa in FIG. 1B). The terminal part of the liquid crystal display panel (the part connected to the FPB 17a of the liquid crystal display panel 10a) is often provided only on one side in the horizontal direction of the liquid crystal display panel. Therefore, as illustrated here, the width (d Fa , d Fb ) of the frame area is generally asymmetric, but as described above, the width (d Pa , d Pb ) of the peripheral display area depends on the frame area. The peripheral display regions having the same width may be arranged symmetrically with respect to the joint region (including the two frame regions and the joint portion).
　次に、図５および図６を参照して、本発明による第２の実施形態の液晶表示装置２００の基本的な構造とその動作を説明する。 Next, the basic structure and operation of the liquid crystal display device 200 according to the second embodiment of the present invention will be described with reference to FIGS.
　液晶表示装置２００は、表示領域２０ａＤと表示領域２０ａＤの外側に形成され、第１軸Ａ１に沿って延びる額縁領域２０ａＦとを有する表示パネル２０ａと、表示領域２０ｂＤと表示領域２０ｂＤの外側に形成され、第１軸Ａ１に沿って延びる額縁領域２０ｂＦとを有する表示パネル２０ｂＤと、表示パネル２０ａの額縁領域２０ａＦと、表示パネル２０ｂの額縁領域２０ｂＦとを互いに接合する接合部２０ａｂと、額縁領域２０ａＦおよび額縁領域２０ｂＦとを含む継ぎ目領域２０Ｊａｂとを有する。液晶表示装置２００は、さらに、額縁領域２０ａＦに配置された複数の光源４２ａを有する。ここでは、額縁領域２０ａＦにのみ光源４２ａを配置した例を示したが、これに限られず、額縁領域２０ｂＦにのみ複数の光源を配置してもよい。液晶表示装置２００は、額縁領域２０ａＦに配置された複数の光源４２ａの輝度を調整することによって、従来黒く観察されていた継ぎ目領域２０Ｊａｂの輝度を、表示領域の輝度に近づけることによって、継ぎ目領域２０Ｊａｂを目立たなくする。 The liquid crystal display device 200 is formed outside the display area 20aD and the display area 20aD, and has a display panel 20a having a frame area 20aF extending along the first axis A1, and outside the display area 20bD and the display area 20bD. , A display panel 20bD having a frame region 20bF extending along the first axis A1, a frame region 20aF of the display panel 20a, a joint portion 20ab for joining the frame region 20bF of the display panel 20b to each other, a frame region 20aF, and And a seam region 20Jab including a frame region 20bF. The liquid crystal display device 200 further includes a plurality of light sources 42a arranged in the frame region 20aF. Here, an example in which the light source 42a is arranged only in the frame area 20aF is shown, but the present invention is not limited to this, and a plurality of light sources may be arranged only in the frame area 20bF. The liquid crystal display device 200 adjusts the luminance of the plurality of light sources 42a arranged in the frame region 20aF, thereby bringing the luminance of the joint region 20Jab, which has been conventionally observed in black, close to the luminance of the display region, thereby providing the joint region 20Jab. Make it inconspicuous.
　ここで、複数の光源４２ａは第１軸Ａ１に沿って一定のピッチで配列されている。このような構成を採用すると、一定のピッチで配列された一定の領域（額縁単位領域）の輝度を制御することができるので、額縁領域を目立たなくできる。 Here, the plurality of light sources 42a are arranged at a constant pitch along the first axis A1. By adopting such a configuration, the brightness of a certain area (frame unit area) arranged at a certain pitch can be controlled, so that the frame area can be made inconspicuous.
　上述したように、単位領域は、輝度が変化する領域（エリア）であって、かつ、他の領域と輝度を比較する基準となる最小の領域（エリア）をいう。第１の実施形態の液晶表示装置における単位領域は、画素領域である表示単位領域と、画素領域と同じ面積を持つ額縁単位領域である。これに対し、第２の実施形態の液晶表示装置における単位領域は、額縁領域２０ａＦに配列された複数の光源４２ａ毎によって輝度が調整される領域（額縁単位領域）と、表示領域の、額縁単位領域と同じ面積を有する領域（表示単位領域）となる。一般に、額縁単位領域が、画素領域より小さくなるように、複数の光源を額縁領域に配列することは難しいからである。また、図５に示したように、継ぎ目領域２０Ｊａｂを構成する２つの液晶表示パネル２０ａ、２０ｂの額縁領域２０ａＦ、２０ｂＦの内の一方だけに複数の光源４２ａを配置する場合等においては、額縁単位領域に代えて、継ぎ目単位領域を考えればよい。また、表示単位領域は画素領域の整数倍の面積しか取り得ないので、額縁単位領域（継ぎ目単位領域）と正確に面積が一致する領域を画定できないことがあるが、額縁単位領域（継ぎ目単位領域）の面積と最も近い面積となるように、表示単位領域を決めればよい。 As described above, the unit area is an area (area) where the luminance changes and is the minimum area (area) that serves as a reference for comparing the luminance with other areas. The unit region in the liquid crystal display device of the first embodiment is a display unit region that is a pixel region and a frame unit region that has the same area as the pixel region. On the other hand, the unit area in the liquid crystal display device according to the second embodiment is an area in which the brightness is adjusted by each of the plurality of light sources 42a arranged in the frame area 20aF (frame unit area) and a frame unit of the display area. It becomes a region (display unit region) having the same area as the region. This is because it is generally difficult to arrange a plurality of light sources in the frame area so that the frame unit area is smaller than the pixel area. Further, as shown in FIG. 5, in the case where a plurality of light sources 42a are arranged only in one of the frame regions 20aF and 20bF of the two liquid crystal display panels 20a and 20b constituting the joint region 20Jab, the frame unit is used. Instead of the region, a joint unit region may be considered. In addition, since the display unit area can only have an area that is an integral multiple of the pixel area, it may not be possible to define an area that exactly matches the area of the frame unit area (seam unit area), but the frame unit area (seam unit area) The display unit region may be determined so as to be the area closest to the area.
　図６（ａ）および（ｂ）を参照して、第２の実施形態の液晶表示装置２００において継ぎ目を見え難くするための各領域の輝度の調整方法を説明する。 With reference to FIGS. 6A and 6B, a description will be given of a method of adjusting the luminance of each region in order to make it difficult to see the joint in the liquid crystal display device 200 of the second embodiment.
　図６（ａ）は、液晶表示装置２００の継ぎ目領域の近傍における輝度分布の例を示す図である。ここでは、簡単のために、液晶表示パネル２０ａの額縁領域２０ａＦが継ぎ目領域２０Ｊａｂの全体を占める場合として説明する。 FIG. 6A is a diagram illustrating an example of the luminance distribution in the vicinity of the joint region of the liquid crystal display device 200. FIG. Here, for the sake of simplicity, description will be made assuming that the frame region 20aF of the liquid crystal display panel 20a occupies the entire joint region 20Jab.
　図６（ａ）では、継ぎ目領域２０Ｊａｂ（＝額縁領域２０ａＦ）に配置された複数の光源４２ａの発光部に対応する領域を２０ａＦE（平均輝度：ＬFEa）で表し、継ぎ目領域２０Ｊａｂの内の発光部に対応する領域を除いた領域を２０ａＦB（平均輝度：ＬFBa）で表している。継ぎ目領域２０Ｊａｂの幅はｄJで、光源４２ａが第１軸Ａ１に沿ってピッチｐで配列されている。継ぎ目単位領域（額縁単位領域）２０ａＦ－ＵＡ（平均輝度：ＬFa）は、縦ｐ、横ｄJの長さを有する長方形で示されている領域である。継ぎ目単位領域（額縁単位領域）２０ａＦ－ＵＡの平均輝度ＬFaは、発光部に対応する領域２０ａＦEの面積をＳとすると、［（ＬFEa・Ｓ）＋{ＬFBa・（ｐ・ｄJ）}］／（ｐ・ｄJ）で表される。ＬFBaが零のときは、ＬFa＝（ＬFEa・Ｓ）／（ｐ・ｄJ）となる。β＝Ｓ／（ｐ・ｄJ）とすると、ＬFa＝β・ＬFEaで表される。 In FIG. 6A, a region corresponding to the light emitting portions of the plurality of light sources 42a arranged in the joint region 20Jab (= frame region 20aF) is represented by 20aF E (average luminance: L FEa ), and the region within the joint region 20Jab The area excluding the area corresponding to the light emitting part is represented by 20aF B (average luminance: L FBa ). The width of the joint region 20Jab is d J , and the light sources 42a are arranged at the pitch p along the first axis A1. A seam unit area (frame unit area) 20aF-UA (average luminance: L Fa ) is an area indicated by a rectangle having a length p and a length d J. The average luminance L Fa seam unit area (frame unit area) 20af-UA, when the area of a region 20af E corresponding to the light emitting portion and S, [(L FEa · S ) + {L FBa · (p · d J )}] / (P · d J ). When L FBa is zero, L Fa = (L FEa · S) / (p · d J ). If β = S / (p · d J ), then L Fa = β · L FEa .
　図６（ｂ）は、図６（ａ）に示された領域に表示されるべき画像（入力映像データに対応する標準の輝度分布）を示す図である。図６（ｂ）において、縦ｐ、横ｄJの長さを有する長方形で示されている領域ＩＤ－ＵＡが表示単位領域である。従って、領域ＩＤ－ＵＡの平均輝度ＬIDと等しくなるように、継ぎ目単位領域（額縁単位領域）２０ａＦ－ＵＡの平均輝度ＬFaを調整することによって、継ぎ目領域２０Ｊａｂを目立たなくできる（ＬFa＝ＬID）。表示単位領域２０ａＤ－ＵＡの平均輝度ＬDaの輝度は領域ＩＤ－ＵＡの平均輝度ＬIDと等しい。従って、上記のことを言い換えると、ある階調の入力映像データに対応する、継ぎ目領域（額縁領域）２０Ｊａｂに含まれる複数の継ぎ目単位領域２０ａＦ－ＵＡの平均輝度ＬFaを表示領域２０ａＤに含まれる表示単位領域２０ａＤ－ＵＡの平均輝度ＬDaと等しくなるように調整することによって、継ぎ目領域２０Ｊａｂを目立たなくできる（ＬFa＝ＬDa）。ここで、上述したように、ＬFa＝β・ＬFEaなので、ＬDa＝β・ＬFEaとなるように、βに応じて、ＬFEaを調整すればよいことになる。 FIG. 6B is a diagram showing an image (standard luminance distribution corresponding to input video data) to be displayed in the area shown in FIG. In FIG. 6B, an area ID-UA indicated by a rectangle having a length of p and width d J is a display unit area. Therefore, by adjusting the average luminance L Fa of the seam unit area (frame unit area) 20aF-UA so as to be equal to the average luminance L ID of the area ID-UA, the seam area 20Jab can be made inconspicuous (L Fa = L ID ). The average luminance L Da of the display unit area 20aD-UA is equal to the average luminance L ID of the area ID-UA. Therefore, in other words, the display area 20aD includes the average luminance L Fa of the plurality of seam unit areas 20aF-UA included in the seam area (frame area) 20Jab corresponding to the input video data of a certain gradation. By adjusting the display unit area 20aD-UA to be equal to the average luminance L Da , the joint area 20Jab can be made inconspicuous (L Fa = L Da ). Here, since L Fa = β · L FEa as described above, L FEa may be adjusted according to β so that L Da = β · L FEa .
　下記の表２に、上記と同じ６０Ｖ型液晶表示パネルを用いた液晶表示装置（ｄJ＝６．５ｍｍ）について、βの異なる光源（例えばＬＥＤ）を種々のピッチｐで配列したときの、輝度比ＬFEa/ＬDaを示す。また、表２には、６０Ｖ型液晶表示パネル１枚当たりに必要な光源の数を示している。例えば、日亜化学工業株式会社製の発光ダイオードＮＳＳＭ０６５（チップサイズ３．０ｍｍ×３．３ｍｍ、発光部２．６ｍｍ□）を用いることができる。発光ダイオードＮＳＳＭ０６５は、Ｒ、ＧおよびＢのそれぞれの発光素子を含むＬＥＤであり、Ｒ、ＧおよびＢのそれぞれの輝度を個別に調整可能なので、表示すべき画像または隣接する領域に表示される画像に応じて、発光輝度および色度を調整することができる。 Table 2 below shows the luminance when light sources (for example, LEDs) having different βs are arranged at various pitches p for a liquid crystal display device (d J = 6.5 mm) using the same 60 V type liquid crystal display panel as described above. shows the ratio L FEa / L Da. Table 2 shows the number of light sources required per 60V type liquid crystal display panel. For example, a light emitting diode NSSM065 (chip size 3.0 mm × 3.3 mm, light emitting portion 2.6 mm □) manufactured by Nichia Corporation can be used. The light-emitting diode NSSM065 is an LED including light-emitting elements of R, G, and B, and the brightness of each of R, G, and B can be adjusted individually, so that an image to be displayed or an image displayed in an adjacent region The light emission luminance and chromaticity can be adjusted accordingly.
　表２に示す条件を満足するように、光源を配置し、輝度を調整することによって、継ぎ目領域２０Ｊａｂを目立たなくできる。光源の数を多くする（光源の配置密度を高くする）ことによって、その効果は増大する。 The seam region 20Jab can be made inconspicuous by arranging the light source and adjusting the luminance so as to satisfy the conditions shown in Table 2. The effect increases by increasing the number of light sources (increasing the arrangement density of the light sources).
　幅ｄJが６．５ｍｍの継ぎ目領域全体に、画素領域と同じ密度になるように、すなわち額縁単位領域が画素領域と等しくなるように、複数の光源をマトリクス状に配列するために必要な光源の数は、６０Ｖ型液晶表示パネル１枚当たり約１２０００個である。このような光源として、例えば、ローム社製のＰＩＣＯＬＥＤ（パッケージサイズ、１ｍｍ×１ｍｍ×厚さ０．２ｍｍ）を用いることができる。このような構成を採用すると、表示品位は優れる反面、上記ＬＥＤを駆動する回路が複雑になる、あるいは、ＬＥＤおよびその実装コストが大きいという問題がある。 Light sources necessary for arranging a plurality of light sources in a matrix so that the entire density of the joint region having a width d J of 6.5 mm is the same as that of the pixel region, that is, the frame unit region is equal to the pixel region. Is about 12,000 per 60V type liquid crystal display panel. As such a light source, for example, PICOLED (package size, 1 mm × 1 mm × thickness 0.2 mm) manufactured by Rohm can be used. When such a configuration is adopted, the display quality is excellent, but there is a problem that the circuit for driving the LED becomes complicated, or the LED and its mounting cost are high.
　従って、要求される表示品位および／またはコストに応じて、光源の配列ピッチｐを設定すればよい。好ましいピッチｐは、液晶表示装置を観察する距離に依存するが、概ね、継ぎ目領域２０Ｊａｂの幅ｄJの１倍以上３倍以下であることが好ましい。 Therefore, the arrangement pitch p of the light sources may be set according to the required display quality and / or cost. The preferable pitch p depends on the distance at which the liquid crystal display device is observed, but is generally preferably not less than 1 and not more than 3 times the width d J of the joint region 20Jab.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　図７および図８に、第２の実施形態の液晶表示装置２００Ａの構造を模式的に示す。図７は、継ぎ目付近の断面構造を模式的に示す図であり、図８は、斜視図である。液晶表示装置が有する液晶表示パネル２０ａ、２０ｂは、例えば液晶表示装置１００の液晶表示パネル１０ａ、１０ｂと同じであり、ここでは説明を省略する。以下、液晶表示装置１００と実質的に同じ構成要素は共通の参照符号で示し、説明を省略することがある。 7 and 8 schematically show the structure of the liquid crystal display device 200A of the second embodiment. FIG. 7 is a diagram schematically showing a cross-sectional structure near the joint, and FIG. 8 is a perspective view. The liquid crystal display panels 20a and 20b included in the liquid crystal display device are the same as the liquid crystal display panels 10a and 10b of the liquid crystal display device 100, for example, and the description thereof is omitted here. Hereinafter, components that are substantially the same as those of the liquid crystal display device 100 are denoted by common reference numerals, and description thereof may be omitted.
　液晶表示装置２００Ａは、筐体１６ａの観察者側の面の上に、実装基板４３ａ上に実装されたＬＥＤ４２ａを有している。ＬＥＤ４２ａは、カバー部材４５ａによって周囲が保護されており、ＬＥＤ４２ａの上部には反射防止膜１８ａが配置されている。液晶表示装置２００Ａは、上述の液晶表示装置２００と実質的に同様に動作し得るので、継ぎ目領域を目立たなくできる。 The liquid crystal display device 200A has the LED 42a mounted on the mounting substrate 43a on the surface of the housing 16a on the viewer side. The periphery of the LED 42a is protected by a cover member 45a, and an antireflection film 18a is disposed on the LED 42a. Since the liquid crystal display device 200A can operate substantially in the same manner as the liquid crystal display device 200 described above, the joint region can be made inconspicuous.
　図９（ａ）および（ｂ）に、液晶表示装置２００Ｂの構造を模式的に示す。図９（ａ）は液晶表示装置２００Ｂの平面図であり、図９（ｂ）は図９（ａ）中の９Ｂ－９Ｂ’線に沿った模式的な断面図である。 9A and 9B schematically show the structure of the liquid crystal display device 200B. FIG. 9A is a plan view of the liquid crystal display device 200B, and FIG. 9B is a schematic cross-sectional view taken along line 9B-9B 'in FIG. 9A.
　液晶表示装置２００Ｂでは、液晶表示装置２００Ａと同様に、筐体１６ａの観察者側の面の上に配置されたＬＥＤ４２ａを有するとともに、さらに、液晶表示パネル２０ｂの額縁領域を覆うように配置された筐体１６ｂの観察者側の面の上にもＬＥＤ４２ｂが配置されている。ＬＥＤ４２ｂは、実装基板４３ｂ上に実装されており、カバー部材４５ｂは実装基板４３ｂ上に設けられている。図９（ａ）に示したように、ＬＥＤ４２ｂもＬＥＤ４２ａと同様に一定のピッチで配列されているが、ＬＥＤ４２ａの配列とＬＥＤ４２ｂの配列とが半ピッチずれている。このような配置を採用すると、より効率的に継ぎ目領域を見えなくすることがきる。 Similarly to the liquid crystal display device 200A, the liquid crystal display device 200B includes the LED 42a disposed on the surface on the viewer side of the housing 16a, and is further disposed so as to cover the frame region of the liquid crystal display panel 20b. The LED 42b is also disposed on the surface of the housing 16b on the viewer side. The LED 42b is mounted on the mounting board 43b, and the cover member 45b is provided on the mounting board 43b. As shown in FIG. 9A, the LEDs 42b are also arranged at a constant pitch, like the LEDs 42a, but the arrangement of the LEDs 42a and the arrangement of the LEDs 42b are shifted by a half pitch. By adopting such an arrangement, the seam region can be made invisible more efficiently.
　図１０（ａ）～（ｃ）に、液晶表示装置２００Ｃの構造を模式的に示す。図１０（ａ）は液晶表示装置２００Ｃの平面図であり、図１０（ｂ）は図１０（ａ）中の１０Ｂ－１０Ｂ’線に沿った模式的な断面図であり、図１０（ｃ）は図１０（ａ）中の１０Ｃ－１０Ｃ’線に沿った模式的な断面図である。 10A to 10C schematically show the structure of the liquid crystal display device 200C. 10A is a plan view of the liquid crystal display device 200C, and FIG. 10B is a schematic cross-sectional view taken along the line 10B-10B ′ in FIG. 10A. FIG. 10 is a schematic cross-sectional view taken along line 10C-10C ′ in FIG.
　液晶表示装置２００Ｃは、液晶表示装置２００ＡにおけるＬＥＤ４２ａに代えて、ＬＥＤ４２ａと導光板４４ａとのセットを有している。従って、液晶表示装置２００Ｃが有するＬＥＤ４２ａの数は、液晶表示装置２００Ａが有するＬＥＤ４２ａの数よりも少ない。導光板４４ａはエッジライト用の導光板であり、導光板４４ａの裏面（筐体１６ａの観察者側の面側）に光を拡散するための凸部４４ａｄを有している。よく知られているように、この凸部４４ａｄの大きさや密度によって、導光板４４ａから出射される光の強度分布を調整することができる。導光板４４ａはこれに限られず、公知の種々の導光板を用いることがきる。 The liquid crystal display device 200C has a set of an LED 42a and a light guide plate 44a instead of the LED 42a in the liquid crystal display device 200A. Therefore, the number of LEDs 42a included in the liquid crystal display device 200C is smaller than the number of LEDs 42a included in the liquid crystal display device 200A. The light guide plate 44a is a light guide plate for edge light, and has a convex portion 44ad for diffusing light on the back surface of the light guide plate 44a (the surface on the viewer side of the housing 16a). As is well known, the intensity distribution of light emitted from the light guide plate 44a can be adjusted by the size and density of the convex portions 44ad. The light guide plate 44a is not limited to this, and various known light guide plates can be used.
　第１の実施形態と第２の実施形態とを適宜組み合わせることもできる（第３の実施形態）。 The first embodiment and the second embodiment can be appropriately combined (third embodiment).
　例えば、図１１に示す液晶表示装置３００は、液晶表示パネル３０ａと３０ｂとを有し、第１の実施形態の液晶表示装置１００のように、周辺表示領域を有するとともに、第２の実施形態の液晶表示装置２００のように、継ぎ目領域に複数の光源を有している。ここで、光源が配置された額縁領域の額縁単位領域３０ａＦ－ＵＡの平均輝度をＬFaとして、（ＬFa・ｄFa＋ＬPa・ｄPa）／（ｄFa＋ｄPa）＝ＬCaという関係式が成立するように、各領域の輝度を調整することが好ましい。すなわち、光源が配置された額縁領域の額縁単位領域３０ａＦ－ＵＡの平均輝度と、周辺表示単位領域の平均輝度ＬPaとの平均が、中央表示単位領域の平均輝度ＬCaと等しくなるように調整されている。額縁単位領域３０ａＦ－ＵＡの平均輝度ＬFaは、上述したように、発光部に対応する領域３０ａＦE（平均輝度：ＬFEa）と、それ以外の額縁領域３０ａＦB（平均輝度：ＬFBa）との面積加重平均として求められる。 For example, the liquid crystal display device 300 shown in FIG. 11 includes liquid crystal display panels 30a and 30b, and has a peripheral display region as in the liquid crystal display device 100 of the first embodiment, and the liquid crystal display device 300 of the second embodiment. Like the liquid crystal display device 200, the joint region has a plurality of light sources. Here, assuming that the average luminance of the frame unit area 30aF-UA of the frame area in which the light source is arranged is L Fa , (L Fa · d Fa + L Pa · d Pa ) / (d Fa + d Pa ) = L Ca It is preferable to adjust the luminance of each region so that is established. That is, the average luminance of the frame unit area 30aF-UA of the frame area where the light source is arranged and the average luminance L Pa of the peripheral display unit area are adjusted to be equal to the average luminance L Ca of the central display unit area. Has been. As described above, the average luminance L Fa of the frame unit area 30aF-UA includes the area 30aF E (average luminance: L FEa ) corresponding to the light emitting unit, and the other frame area 30aF B (average luminance: L FBa ). It is calculated as an area weighted average.
　また、このとき、継ぎ目単位領域と、その両側に配置された２周辺表示単位領域とで構成される、縦ｐ、横ｄｘの長さを有する長方形の領域を１つの単位領域と考え、この単位領域の平均輝度を、図１１（ｂ）に示す、その単位領域に表示されるべき画像（入力映像データに対応する標準の輝度分布）の平均輝度（図１１（ｂ）中のＩＤ－ＵＡ（平均輝度：ＬID）と等しくすることもできる。これは、例えば、第１の実施形態の液晶表示装置１００について説明したように、周辺表示領域に照射するバックライトの輝度を高めることによって実現できる。 Further, at this time, a rectangular area having a length of p and width d x composed of a seam unit area and two peripheral display unit areas arranged on both sides thereof is considered as one unit area. The average luminance of the unit area is shown in FIG. 11B. The average luminance (ID-UA in FIG. 11B) of the image (standard luminance distribution corresponding to the input video data) to be displayed in the unit area is shown. (Average luminance: L ID ), which is realized by, for example, increasing the luminance of the backlight that irradiates the peripheral display area, as described for the liquid crystal display device 100 of the first embodiment. it can.
　このように、第１の実施形態によって周辺表示単位領域の平均輝度を高くする、あるいは、第２の実施形態によって額縁単位領域の平均輝度を高くする、のいずれか一方だけの構成を採用するよりも、周辺表示単位領域または額縁単位領域の平均輝度を低くできるという利点が得られる。 As described above, the configuration in which either the average brightness of the peripheral display unit area is increased according to the first embodiment or the average brightness of the frame unit area is increased according to the second embodiment is adopted. In addition, there is an advantage that the average luminance of the peripheral display unit area or the frame unit area can be lowered.
　なお、継ぎ目領域が視認されるかどうかは観察距離に依存する。また、上記のように、周辺表示領域や継ぎ目領域の輝度を調整すると、近距離で観察する場合、例えば上記の６０Ｖ型液晶表示パネルを用いた例では約１ｍよりも近づいて観察すると、周辺表示領域や継ぎ目領域が目立つことがある。これを防止するために、液晶表示装置に、人感センサ（例えば赤外線センサ）を設け、人感センサによって人が液晶表示装置に所定の距離よりも接近したと判断したときには、通常の表示動作を行うように構成してもよい。すなわち、周辺表示領域の輝度および／または継ぎ目領域の輝度を上昇させるという表示動作を行わないようにしてもよい。 Note that whether or not the seam area is visible depends on the observation distance. Further, as described above, by adjusting the brightness of the peripheral display area and the joint area, when observing at a short distance, for example, in the example using the 60V liquid crystal display panel, the peripheral display Areas and seam areas may be noticeable. In order to prevent this, a human sensor (for example, an infrared sensor) is provided in the liquid crystal display device. When the human sensor determines that the person has approached the liquid crystal display device more than a predetermined distance, a normal display operation is performed. It may be configured to do. That is, the display operation of increasing the brightness of the peripheral display area and / or the brightness of the joint area may not be performed.
　本発明は、表示装置、特に直視型の表示装置に広く適用できる。 The present invention can be widely applied to display devices, particularly direct-view display devices.
　１０ａ、１０ｂ、１０ｃ、１０ｄ　液晶表示パネル
　１０ａＤ　表示領域
　１０ａＦ　第１額縁領域
　１０ａＤP 第１周辺表示領域
　１０ａＤC 第１中央表示領域
　１０ｂＤ　表示領域
　１０ｂＦ　第２額縁領域
　１０ｂＤP 第２周辺表示領域
　１０ｂＤC 第２中央表示領域
　１０ａｂ　接合部
　１０Ｊａｂ　継ぎ目領域
　１００　　液晶表示装置 10a, 10b, 10c, 10d Liquid crystal display panel 10aD Display area 10aF First frame area 10aD P First peripheral display area 10aD C First central display area 10bD Display area 10bF Second frame area 10bD P Second peripheral display area 10bD C First 2 center display area 10ab joint 10Jab joint area 100 liquid crystal display device

Claims (20)

  1. 　第１表示領域と前記第１表示領域の外側に形成され、第１軸に沿って延びる第１額縁領域とを有する第１表示パネルと、
    　第２表示領域と前記第２表示領域の外側に形成され、前記第１軸に沿って延びる第２額縁領域とを有する第２表示パネルと、
    　前記第１表示パネルの前記第１額縁領域と、前記第２表示パネルの前記第２額縁領域とを互いに接合する接合部と、前記第１額縁領域および第２額縁領域とを含む継ぎ目領域とを有し、
    　前記第１表示領域は、前記第１軸と交差する第２軸に沿って前記第１額縁領域に隣接する第１周辺表示領域と、前記第２軸に沿って前記第１周辺表示領域に隣接する第１中央表示領域とを有し、
    　前記第２表示領域は、前記第２軸に沿って前記第２額縁領域に隣接する第２周辺表示領域と、前記第２軸に沿って前記第２周辺表示領域に隣接する第２中央表示領域とを有し、
    　前記第１表示領域、前記第２表示領域、前記第１額縁領域、および、前記第２額縁領域のそれぞれは複数の単位領域を有し、前記単位領域は、輝度が変化する領域であって、かつ、他の領域と輝度を比較する基準となる最小の領域であり、
    　ある階調の入力映像データに対応する、前記第１周辺表示領域に含まれる複数の第１周辺表示単位領域の平均輝度は、前記第１中央表示領域に含まれる複数の第１中央表示単位領域の平均輝度よりも高い、表示装置。     A first display panel having a first display area and a first frame area formed outside the first display area and extending along a first axis;
    A second display panel having a second display region and a second frame region formed outside the second display region and extending along the first axis;
    A joint that joins the first frame region of the first display panel and the second frame region of the second display panel to each other; and a seam region that includes the first frame region and the second frame region. Have
    The first display area is adjacent to the first peripheral display area along the second axis that intersects the first axis, and adjacent to the first peripheral display area along the second axis. A first central display area to
    The second display area includes a second peripheral display area adjacent to the second frame area along the second axis, and a second central display area adjacent to the second peripheral display area along the second axis. And
    Each of the first display area, the second display area, the first frame area, and the second frame area has a plurality of unit areas, and the unit areas are areas in which luminance changes, And it is the minimum area that serves as a reference for comparing brightness with other areas,
    The average luminance of the plurality of first peripheral display unit areas included in the first peripheral display area corresponding to input video data of a certain gradation is the plurality of first central display unit areas included in the first central display area. A display device that is higher than the average brightness.
  2. 　ある階調の入力映像データに対応する、前記複数の第１中央表示単位領域の平均輝度をＬCa、前記複数の第１周辺表示単位領域の平均輝度をＬPa、前記第１周辺表示領域の平均の幅をｄPa、前記第１額縁領域に含まれる複数の第１額縁単位領域の平均輝度をＬFa、前記第１額縁領域の平均の幅をｄFaとすると、（ＬFa・ｄFa＋ＬPa・ｄPa）／（ｄFa＋ｄPa）＝ＬCaが成立する、請求項１に記載の表示装置。 The average brightness of the plurality of first central display unit areas corresponding to input video data of a certain gradation is L Ca , the average brightness of the plurality of first peripheral display unit areas is L Pa , and the first peripheral display area Assuming that the average width is d Pa , the average luminance of the plurality of first frame unit areas included in the first frame area is L Fa , and the average width of the first frame area is d Fa , (L Fa · d Fa The display device according to claim 1, wherein + L Pa · d Pa ) / (d Fa + d Pa ) = LCa is established.
  3. 　ｄFa＜ｄPa＜４ｄFaの関係を満足する、請求項２に記載の表示装置。 satisfy the relation: d Fa <d Pa <4d Fa , display device according to claim 2.
  4. 　ある階調の入力映像データに対応する、前記第２周辺表示領域に含まれる複数の第２周辺表示単位領域の平均輝度は、前記第２中央表示領域に含まれる複数の第２中央表示単位領域の平均輝度よりも高い、請求項２または３に記載の表示装置。 The average luminance of the plurality of second peripheral display unit areas included in the second peripheral display area corresponding to the input video data of a certain gradation is the plurality of second central display unit areas included in the second central display area. The display device according to claim 2, wherein the display device is higher than the average luminance.
  5. 　ある階調の入力映像データに対応する、前記複数の第２中央表示単位領域の平均輝度をＬCb、前記複数の第２周辺表示単位領域の平均輝度をＬPb、前記第２周辺表示領域の平均の幅をｄPb、前記第２額縁領域に含まれる複数の第２額縁単位領域の平均輝度をＬFb、前記第２額縁領域の平均の幅をｄFbとすると、（ＬFb・ｄFb＋ＬPb・ｄPb）／（ｄFb＋ｄPb）＝ＬCbが成立する、請求項４に記載の表示装置。 The average luminance of the plurality of second central display unit areas corresponding to input video data of a certain gradation is represented by L Cb , the average luminance of the plurality of second peripheral display unit areas is represented by L Pb , and the second peripheral display unit area Assuming that the average width is d Pb , the average luminance of the plurality of second frame unit areas included in the second frame area is L Fb , and the average width of the second frame area is d Fb , (L Fb · d Fb The display device according to claim 4, wherein + L Pb · d Pb ) / (d Fb + d Pb ) = L Cb is satisfied.
  6. 　ｄFb＜ｄPb＜４ｄFbの関係を満足する、請求項５に記載の表示装置。 The display device according to claim 5, wherein the relationship d Fb <d Pb <4d Fb is satisfied.
  7. 　前記継ぎ目領域の平均の幅をｄJとすると、ｄJ／２＜ｄPa＜２ｄJおよびｄJ／２＜ｄPb＜２ｄJの関係を満足する、請求項５に記載の表示装置。 6. The display device according to claim 5, wherein d J / 2 <d Pa <2d J and d J / 2 <d Pb <2d J are satisfied, where d J is an average width of the joint region.
  8. 　前記第１周辺表示領域の幅は前記第１軸に沿って変化している、請求項１から７のいずれかに記載の表示装置。 The display device according to any one of claims 1 to 7, wherein a width of the first peripheral display area changes along the first axis.
  9. 　ある階調の入力映像データに対応する、前記複数の第１周辺表示単位領域の輝度は、前記第１額縁領域側で高く、前記第１中央表示領域側で低い分布を有している、請求項１から８のいずれかに記載の表示装置。 The luminance of the plurality of first peripheral display unit areas corresponding to input video data of a certain gradation has a distribution that is high on the first frame area side and low on the first central display area side. Item 9. The display device according to any one of Items 1 to 8.
  10. 　前記表示装置は、バックライトをさらに有し、
    　前記バックライトから出射され前記第１周辺表示領域に入射する光の輝度は、前記バックライトから出射され前記第１中央表示領域に入射する光の輝度よりも高い、請求項９に記載の表示装置。     The display device further includes a backlight,
    10. The display device according to claim 9, wherein a luminance of light emitted from the backlight and incident on the first peripheral display region is higher than a luminance of light emitted from the backlight and incident on the first central display region. .
  11. 　前記第１額縁領域および前記第２額縁領域は黒色であって、反射防止処理が施されている、請求項１から１０のいずれかに記載の表示装置。 The display device according to any one of claims 1 to 10, wherein the first frame region and the second frame region are black and are subjected to an antireflection treatment.
  12. 　第１表示領域と前記第１表示領域の外側に形成され、第１軸に沿って延びる第１額縁領域とを有する第１表示パネルと、
    　第２表示領域と前記第２表示領域の外側に形成され、前記第１軸に沿って延びる第２額縁領域とを有する第２表示パネルと、
    　前記第１表示パネルの前記第１額縁領域と、前記第２表示パネルの前記第２額縁領域とを互いに接合する接合部と、前記第１額縁領域および第２額縁領域とを含む継ぎ目領域とを有し、
    　さらに、前記第１額縁領域に配置された複数の第１光源を有する、表示装置。     A first display panel having a first display area and a first frame area formed outside the first display area and extending along a first axis;
    A second display panel having a second display region and a second frame region formed outside the second display region and extending along the first axis;
    A joint that joins the first frame region of the first display panel and the second frame region of the second display panel to each other; and a seam region that includes the first frame region and the second frame region. Have
    Furthermore, the display apparatus has a plurality of first light sources arranged in the first frame region.
  13. 　前記複数の第１光源は前記第１軸に沿って一定のピッチで配列されている、請求項１２に記載の表示装置。 The display device according to claim 12, wherein the plurality of first light sources are arranged at a constant pitch along the first axis.
  14. 　前記第１表示領域、前記第２表示領域、前記第１額縁領域、および、前記第２額縁領域のそれぞれは複数の単位領域を有し、前記単位領域は、輝度が変化する領域であって、かつ、他の領域と輝度を比較する基準となる最小の領域であり、
    　ある階調の入力映像データに対応する、前記第１額縁領域に含まれる複数の第１額縁単位領域の平均輝度は、前記第１表示領域に含まれる複数の第１表示単位領域の平均輝度と等しい、請求項１２または１３に記載の表示装置。     Each of the first display area, the second display area, the first frame area, and the second frame area has a plurality of unit areas, and the unit areas are areas in which luminance changes, And it is the minimum area that serves as a reference for comparing brightness with other areas,
    The average brightness of the plurality of first frame unit areas included in the first frame area corresponding to input video data of a certain gradation is the average brightness of the plurality of first display unit areas included in the first display area. The display device according to claim 12 or 13, which is equal.
  15. 　さらに、前記第２額縁領域に配置された複数の第２光源を有する、請求項１２から１４のいずれかに記載の表示装置。 The display device according to claim 12, further comprising a plurality of second light sources arranged in the second frame region.
  16. 　前記複数の第２光源は前記第１軸に沿って一定のピッチで配列されており、且つ、前記複数の第１光源の配列と前記複数の第２光源の配列とが半ピッチずれている、請求項１５に記載の表示装置。 The plurality of second light sources are arranged at a constant pitch along the first axis, and the arrangement of the plurality of first light sources and the arrangement of the plurality of second light sources are shifted by a half pitch. The display device according to claim 15.
  17. 　前記複数の第１光源および前記複数の第２光源はマトリクス状に配列されている、請求項１５に記載の表示装置。 The display device according to claim 15, wherein the plurality of first light sources and the plurality of second light sources are arranged in a matrix.
  18. 　前記第１表示領域、前記第２表示領域、前記第１額縁領域、および、前記第２額縁領域のそれぞれは複数の単位領域を有し、前記単位領域は、輝度が変化する領域であって、かつ、他の領域と輝度を比較する基準となる最小の領域であり、
    　ある階調の入力映像データに対応する、前記継ぎ目領域に含まれる複数の継ぎ目単位領域の平均輝度は、前記第１表示領域に含まれる複数の第１表示単位領域の平均輝度および前記第２表示領域に含まれる複数の第２表示単位領域の平均輝度と等しい、請求項１２から１７のいずれかに記載の表示装置。     Each of the first display area, the second display area, the first frame area, and the second frame area has a plurality of unit areas, and the unit areas are areas in which luminance changes, And it is the minimum area that serves as a reference for comparing brightness with other areas,
    The average brightness of the plurality of seam unit areas included in the seam area corresponding to input video data of a certain gradation is the average brightness of the plurality of first display unit areas included in the first display area and the second display. The display device according to claim 12, wherein the display device is equal to an average luminance of a plurality of second display unit regions included in the region.
  19. 　さらに、前記第１額縁領域に配置された導光板を有する、請求項１２から１８のいずれかに記載の表示装置。 The display device according to claim 12, further comprising a light guide plate disposed in the first frame region.
  20. 　人感センサをさらに備える、請求項１から１９のいずれかに記載の表示装置。 The display device according to claim 1, further comprising a human sensor.
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